At the close of the year 1805, he made an unsuccessful attempt to be appointed to take part in an exploratory expedition which the American government was then about to send to the valley of the Mississippi. He addressed his application on this occasion to President Jefferson, stating to that functionary what he had done in the prosecution of his intended work on American ornithology, and representing the advantages which the being permitted to accompany the party would afford him in furthering his views. To this communication from what cause is now unknown - he obtained no reply, and of course did not join the expedition. Soon after this, more cheering prospects presented themselves to the enterprising ornithologist. A Mr. Samuel F. Bradford, a publisher in Philadelphia, who was about to print an edition of Rees's Cyclopedia, engaged Wilson, on what the latter himself called liberal terms, to superintend the publication of that work. But this connection presented another inducement to Wilson, and one which had infinitely greater attraction for him than any which related to his own personal advantage. This was the prospect it afforded him of procuring a publisher for his work; and so far he was not disappointed. On his explaining the nature and object of his undertaking, Mr. Bradford readily consented to become his publisher; and in September 1808, the first volume of American Ornithology' appeared, one of the most splendid books by far which had then emanated from the American press; but unfortunately the price was, though necessarily, much too high for a country comparatively in its infancy, and which had not then had time to turn its attention to the arts or sciences, or to acquire a sufficient taste for them to encourage such an expensive appeal on their behalf. The price of the work, when completed, was to be one hundred and twenty dollars. It is not therefore at all surprising to find that, even a considerable time after its publication, its ingenious, but in this respect certainly injudicious author, could only boast of forty-one names on his list of subscribers. This number, however, he afterwards increased to two hundred and fifty, by traveling through the country, and visiting the different towns in quest of patrons; but these, he himself says, were obtained at a price worth more than five times the amount;' and they no doubt were so, if wounded feelings, fatigue of body and mind, and all the humiliations to which such a mission must of necessity have frequently subjected him, be taken into the account. From this tour he returned to New York in March 1809.

Two hundred copies only of the first volume of the Ornithology had been printed, but it was now thought advisable to throw off three hundred more; which was accordingly done: and in the meantime Wilson assiduously employed himself in preparing the second volume for the press, although he neither had yet benefited to the extent of a single dollar by the publication of his work, nor was likely to do so. The second volume appeared in January 1810; and immediately after its appearance, the author set out on another tour in quest of support and patronage. time he penetrated into the western part of the States, or valley of the Ohio and Mississippi. At Pittsburg, he succeeded beyond his expectations in getting subscribers; and after ascertaining that the roads were such as to render a land journey impossible, he bought a small boat, which he named the Ornithologist, intending to proceed in it down the Ohio to Cincinnati, a distance of more than five hundred miles. Some advised him

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not to undertake the journey alone; but he had made up his mind, and only waited, exploring the woods in the interval, till the ice had left the the stream. At length the time arrived for his departure on this inland voyage. His provision consisted of some biscuit and cheese, and a bottle of cordial, given him by a gentleman in Pittsburg: one end of the boat was occupied by his trunk, greatcoat, and gun; and he had a small tin vessel, with which to bale his boat, and to drink the water of the Ohio. Thus equipped, he launched into the stream. The weather was calm, and the river like a mirror, except where fragments of ice were floating down. His heart expanded with delight at the novelty and wildness of the scene. The song of the red-bird in the deep forests on the shore, the smoke of the various sugar-camps rising gently along the mountains, and the little log-huts which here and there opened from the woods, gave an appearance of life to a landscape which would otherwise have been lonely and still. He could not consent to the slow motion of the river, which flowed two miles and a half an hour; he therefore stripped himself for the oar, and added three miles and a half to his speed. Our traveler's lodgings by night were less tolerable than his voyage, as he went down the desolate stream. The first night was passed in a log-cabin, fifty-two miles below Pittsburg, where he slept on a heap of straw.

Having reached Cincinnati, he there got a few subscribers for his work, and then proceeded to Louisville, where he sold his boat. He next walked a distance of seventy-two miles to Lexington, whence he traveled to Nashville, exploring on his journey some of the remarkable caverns of Kentucky. He had thoughts of extending his tour to St. Louis; but after considering that it would detain him a month, and add four hundred miles to his journey, without perhaps adding a single subscriber to his list, he gave up the plan, and prepared for a passage through the wilderness towards New Orleans. He was strongly urged not to undertake it, and a thousand alarming representations of hardship and danger were set before him; but, as usual, he gave fears to the winds, and quietly made preparations for the way. He set out on the 4th of May, on horseback, with a pistol in each pocket, and a fowling-piece belted across his shoulder. During this adventurous journey he suffered severely from the heat of the sun, and all the changes of the weather. His exposure by night and day brought on an illness, which he with difficulty surmounted. He had occasion to travel among the Indians, who, it seems, treated him with great kindness; and though dreadfully worn out with fatigue, he enjoyed the journey very much. He reached New Orleans on the 6th of June, and shortly after embarked in a vessel for New York, and from thence he proceeded to Philadelphia, where he arrived on the 2d of August 1810.

Wilson now applied himself with unwearied industry to the preparation of the third volume of his Ornithology. At this time, he says that the number of birds which he had found, and which had not been noticed by any other naturalist, amounted to forty. Between this period and 1812 he made several other journeys throughout the country, partly with the view of promoting the sale of his publication, and partly to procure materials for his study, an object which he never lost sight of seldom traveling, whatever might be the immediate or ostensible cause of his changing place, without his fowling-piece.

In the year above named, he received a gratifying proof of the estima

tion in which his merits were beginning to be held. This was his being chosen a member of the Society of Artists of the United States; and in the spring of the following year, he was admitted to the American Philosophical Society in Philadelphia. But this extraordinary man was not destined to see either the completion of his meritorious labors, or to enjoy the triumph of achieving all that he designed. The excessive labor and fatigue of both body and mind to which he had for many years subjected himself, gradually undermined his constitution, and prepared it to yield to the first act of indiscretion to which it should be exposed; and this, unfortunately, now very soon occurred.

While sitting one day with a friend, he caught a glimpse from the window of a rare bird, for which he had long been vainly looking out. The instant he saw it he seized his gun, rushed out of the house in pursuit of it, and after an arduous chase, during which he swam across a river, succeeded in killing it; but he succeeded at the expense of his life. He caught a violent cold; this was followed by dysentery, which carried him off after an illness of ten days. He died on the morning of the 23d August 1813, in the forty-seventh year of his age, and was buried in the cemetery of the Swedish church in Southwark, Philadelphia. A plain marble monument, with an inscription intimating his age, the place and date of his birth, and of his death, marks the place of his sepulture.

Wilson had completed the seventh volume of his Ornithology before he died, and was engaged, when seized with his last illness, in collecting materials for the eighth. At this he labored with an assiduity and unintermitting industry which called forth the remonstrances of his friends. His reply, while it seems to indicate a presentiment of his premature fate, is at the same time characteristic of his extraordinary enthusiasm and diligence. Life is short,' he would say on these occasions, and nothing can be done without exertion.' Nor is a wish which he repeatedly expressed to a friend some time before his death, less characteristic of his amiable nature and deep admiration of the works of his Creator. This wish was that he might be buried where the birds might sing over his grave. His person is described as having been tall and handsome, rather slender than robust; his countenance expressive and thoughtful, and his eye intelligent. Unfortunately for himself, the speculation in which he engaged with so much ardor yielded him no remuneration; for he had committed the serious error of issuing his work on too expensive a scale. From the publication he derived no profits whatever; and the heavy expenses he had to incur in his journeys, as well as his ordinary outlays, were only paid by the wages he received in the capacity of colorer of his own plates. Of the many active men whose biographies are before the public, there is not, perhaps, one whose life presents such a heroic resolution in the pursuit of science as Wilson. Although this most indefatigable genius did not live to enjoy the reward of his diligence, he certainly anticipated what has come to pass-that this work would always be regarded as a subject of pride by his adopted country, as it certainly is by the country which gave him birth, and would secure a high degree of honor for him whose name it bears.

JAMES WATT.

JAMES WATT, the son of a merchant, was born at Greenock, in Scotland, on the 19th of January, 1736. He received the first part of his education at a school in his native place, and completed it at home, by his own diligence. The science of mechanics, for which he afterwards became so famous, formed, at an early age, his favorite study; and, in conformity with his desire, he was, at the age of eighteen, apprenticed to a mathematical instrument-maker, in London. The bad state of his health, however, which had before retarded his progress at school, compelled him to return, after a year's stay in the metropolis, to Scotland. This was all the instruction he ever received in the business for which he was intended, yet he must have attained considerable skill, as, in 1757, he, at the recommendation of some relations, commenced the practice of it, at Glasgow, and was immediately appointed mathematical instrument-maker to the college. He continued to hold this situation till 1763, when he married, left his apartments in the university, for a house in the town of Glasgow, and commenced the profession of a general engineer. He soon acquired a high reputation; and in making surveys and estimates for canals, harbors, bridges, and other public works, was as extensively employed in his own country, as Brindley had been in England.

His attention to the employment of steam, as a mechanical agent, had been, in the first instance, excited by witnessing some experiments of his friend Mr. John (afterwards Dr.) Robison, and he had also made some experiments himself, with a view of ascertaining its expansive force. It was not, however, till 1763-4 that he began to devote himself seriously to the investigation of the properties of steam, and to ascertain those results upon which his fame was to be founded. An examination of Newcomen's engine, a model of which had been sent him to repair, revived all his former impressions respecting the radical imperfections of the atmospheric machine, to the improvements of which he now ardently devoted himself. One of his first discoveries was, that the rapidity with which water evaporates, depends simply upon the quantity of heat which is imbibed, and this again on the extent of the surface of the vessel containing the water, exposed to the fire. He ascertained also the quantity of coals necessary for the evaporation of any given quantity of water, the heat at which it boils under various pressures, and many other particulars never before accurately determined.

He now proceeded to attempt a remedy of the two grand defects of Newcomen's engine-the necessity of cooling the cylinder before every stroke of the piston, by the water injected into it; and the non-employment of the machine, for a moving power, of the expansive force of the steam. On account of the first defect, a much more powerful application of heat than would otherwise have been requisite was demanded for the purpose of again heating the cylinder, when it was to be refilled with steam. To keep this vessel, therefore, permanently hot, was the grand desideratum; and Watt at length hit upon an expedient equally simple and successful. His plan was to establish a communication, by an open pipe, between the cylinder and another vessel, the consequence of which would be, that when the steam was admitted into the former, it would flow into