at 12 noon. Arrangements have been made with leading engineering firms in Edinburgh and elsewhere whereby students may combine their apprenticeship with their studies at the College. A similar arrangement has been mate for Brewers' Apprentices, and special facilities are offered to Chemistry Students for the study of the Analysis of Fuels, Gases, and Coal Distillatios Bye-Products in the Laboratories of the Corporation's Gas Works. The Day College Calendar, which contains full particulars, may be ba on application to the PRINCIPAL, at the College. PETER MACNAUGHTON, S.S.C., Clerk. 20 York Place, Edinburgh, July 20, 1906. ENGINEERING AND TECHNICAL OPTICS. NORTHAMPTON INSTITUTE, CLERKENWELL, LONDON, E.C. MECHANICAL AND ELECTRICAL ENGINEERING. Full Day Courses in the theory and practice of the above subjects will commence on Monday, October 1, 1906. Entrance Examination on Wednesday and Thursday, September 26 and 27. These Courses include periods spent in commercial workshops, and extend over four years. They also prepare for the degree of B.Sc. in Engineering at the University of London. Fees, 615 or 611 per annum. Three Entrance Scholarships of the value of £52 each will be offered for competition at the Entrance Examination in September next. 103 BOROUGH ROAD, LONDON, S. E. (Five Minutes from Blackfriars, Westminster, Waterloo, Southwark and London Bridges.) TECHNOLOGICAL CHEMISTRY. The Course is arranged for two or three years, and is intended for those who desire to become technical chemists and to enter chemical or other works. For this reason, instruction not only in Chemistry, but in Physics, Engineering and Mathematics is given. In the Course special attention is paid to the Electrochemical side. Fee for the Course-October to July-£10. A Prospectus containing full particulars of the Lecture and Laboratory Courses in Inorganic and Organic Chemistry qualifying for the Degrees in Chemistry, and for the Certificate in Applied Chemistry, will be forwarded EGYPTIAN GOVERNMENT. MINISTRY OF EDUCATION. The following post at the School of Medicine, Cairo, is vacant : The appointment is for two years, and may be renewed at the end of that time. Applicants should forward copies of testimonials and such other particulars as are mentioned below. The pay of the post is E. 320 per annum, the Egyptian Pound being worth 6d. more than the Pound Sterling. Private Practice is not allowed. It is to be distinctly understood that the appointment gives no claim to pension or indemnity. The Government reserves to itself the right to dismiss the assistant for misconduct or incapacity. In the Government Schools, as in all State Administrations in Egypt, Sunday is a working day. The Schools are closed on Fridays. Leave will be granted on the same terms as to other Government Officials. The possibility of taking leave, and the period of the year at which it is granted, depend upon the exigencies of the service. Pay commences from date of arrival in Cairo. On taking up his duties in Cairo, the Assistant will receive one month's pay in lieu of passage money. All applicants should attach a certificate from a legally qualified medical man, stating that in his opinion the candidate would pass as a first-class life for insurance purposes. All applicants should state : Their training and qualifications in Analytical Chemistry, Their age, What foreign languages they know, and If they can be in Cairo by October 1. require a LECTURER in PHYSICS and a LECTURER in CHEMISTRY for the Colombo Medical and Technical Colleges. Salary for each post, £400, rising by annual increments of £25 to £500 a year. The Government also require a SCIENCE MASTER for the Royal College, Colombo, to teach Chemistry and Physics for London University Pass Examinations, including the Intermediate B.Sc. Salary, £350, rising to £450 by annual increments of £25. For the above appointments preference will be given to graduates in Free passages to the Colony. Leave and pension on same terms as to other officers of the permanent service. Applications should be sent before August 15 to the ASSISTANT PRIVATE SECRETARY, Colonial Office, S. W., and envelopes should be marked with the name of the post applied for. Copies only of testimonials (not more than six). The Committee invite applications for the post of TEACHER of CHEMISTRY (Theoretical and Practical), who may be required to give instruction on four evenings per week for about three hours per evening. Salary, £90 per Winter Session of about 30 weeks. Applications should be forwarded not later than August 11 to Mr. D. F. BROW, Technical Institute, Dartford, Kent, from whom further particulars may be obtained. UNIVERSITY COLLEGE OF SOUTH WALES AND MONMOUTHSHIRE, CARDIFF. The Council of the College invites applications for the post of DE. MONSTRATOR and ASSISTANT LECTURER in BOTANY. Further particulars may be obtained from the undersigned, by whom applications with testimonials (which need not be printed) must be received on or before Saturday, September 1, 1906. J. AUSTIN JENKINS, B.A., Registrar. University College, Cardiff, July 17, 1906. Salaries £400 to £500, £350 to £450, and £300 to £400. 20 Science Graduates for Public Colleges, England and Abroad Also Woodwork vacancy, £150. List of Science and Mathematical Vacancies sent to all Candidates. can guarantee each candidate with good references an appointment. No fee till suited. ESTD. OVER 50 YEARS. ENGINEERING M.Inst.C. E. JAssociate Professor-J. 1 M. Inst.C.E. A. Brodie, MUNICIPAL ELECTRICAL/Associate Professor A. BROMLEY The courses o study in the Faculty leading to the ordinary degree of Bachelor of Engineering or the certificate in Engineering are so arranged as to afford a general scientific training for those intending to become engineers or to enter any allied profession. The Honours course enables students to specialise in some branch of the profession, and opportunities are afforded for post-graduate work and research. The special Prospectus of the Faculty may be obtained on application to the REGISTRAR. MINISTRY OF EDUCATION, EGYPT. SCHOOL OF AGRICULTURE. POLLARD, M.A. A VETERINARY SURGEON, having a knowledge of Botany and THE ADJUSTMENT OF THE CURRICULUM. By A. T. Entomology, is required for the teaching staff of the above School. Candidates should be from 25 to 35 years of age, and unmarried. Applications should be accompanied by a certificate from a legally qualified medical man, stating that in bis opinion the candidate would pass as a first-class life for insurance purposes. Salary about £295 per annum (L.Eg. 24 per mensem), rising to about £393 per annum (L. Eg. 32 per mensem). Salary will be reckoned from the date of arrival in Cairo, and one month's salary will be paid in lieu of travelling allowance. In the Government Schools, as in all State Administrations in Egypt, Sunday is a working day. The Schools are closed on Fridays. Applications, with full statement of qualifications, and accompanied by copies only of testimonials, must be sent in before August 20, addressed to W. C. MACKENZIE, Esq., Seaforth, Gullane, N.B., from whom further information may be obtained. HARPER-ADAMS AGRICULTURAL COLLEGE. NEWPORT, SALOP. LECTURER IN MATHEMATICS AND LAND-SURVEYING. Applications are invited for the above Lectureship on or before August 12. The Lecturer will be required to enter upon his duties on October 1, 1906 Full particulars can be obtained on application to the PRINCIPAL. ΤΟ SCIENCE AND MATHEMATICAL MASTERS.-September Vacancies --Graduates other well qualified Masters seeking posts in Public and other Schools in Science and ARITHMETIC AS A MENTAL EXERCISE. By H. G. OBJECT LESSONS. I. By O. H. LATTER, M A. ON WORD-BUILDING. should apply at once, giving full details as to qualifications, &c. Some Geographical Apparatus. (Illustrated.) to Messrs. GRIFFITHS, SMITH, POWELL & SMITH, Tutorial Agents (Estd. 1833), 34 Bedford Street, Strand, London. Immediate notice of all the best vacancies will be sent. TYPE-WRITING UNDERTAKEN BY HIGHLY EDUCATED WOMEN ACCUSTOMED TO SCIEN TIFIC MSS. (Classical Tripos, Intermediate Arts, Cambridge Higher Local, thorough acquaintance with Modern Languages). Research, Revision, Translation. Scale of charges on application. The Cam. Size to produce 2 gallons per hour, £3 15s. Pamphlets on application. BROWN & SON, Engineers, Coppersmiths, and Joiners, Improved Calcimeter Designed by S. H. COLLINS, Esq., F.I.C., F.C.S. With this apparatus much greater accuracy can be obtained than has hitherto been possible, and it is more rapid in use. Calculations are reduced to a minimum by means of tables and a special slide rule. Price £2 5 0 For full particulars see Journal Society Chemical Industry, JUNE 15, 1906, page 518. Sole Makers: MURIEL STREET, & CHARLOTTE STREET, LONDON, N. BRADY & MARTIN, LTD., Laboratory Furnishers and Fitters. G. BOWRON, 57 EDGWARE ROAD, LONDON, W. has always on hand a large and varied stock of SECOND-HAND Institutions, Polytechnics, &c. NEWCASTLE-UPON-TYNE. DARTON'S NEW DIAL BAROGRAPH, NATURE says: "Teachers requiring efficient apparatus at a low F. DARTON & CO., CLERKENWELL cost for lecture or laboratory purposes, might consult the list with advantage." List on application by mentioning NATURE. ALUMINIUM RECTIFIERS. FREDK. JACKSON & Co. Patent No. 18013. For charging any class of accumulators, driving small motors, &c., direct from alternating mains. Works on any periodicity or voltage; (Late MOTTERSHEAD & CO.), 14 CROSS STREET, MANCHESTER. Goods Entrance: 10 Half-Moon Street. action absolutely infallible: LABORATORY FURNISHERS. DO moving parts; high efficiency; requires no attention. Made (by agreement with the Nodon Valve) in four sizes to charge from 1 amp. to 10 amps. Prices from £3 3s. to £8 8s. THE ELECTRICAL COMPANY, Ltd., 121-125 Charing Cross Road, Telephone: 4311-4314 Gerrard. London, W.C. Importers, Manufacturers, and Dealers in CHEMICAL AND PHYSICAL APPARATUS Of every Description. FINE CHEMICALS, VOLUMETRIC SOLUTIONS Telegraphic Address-"APPARATUS, MANCHESTER. Telephone Number-2238. MACMILLAN & CO.'S LIST. THE LIFE & EXPERIENCES OF Sir Henry Roscoe, D.C.L., LL.D., F.R.S. Written by Himself. With Photogravure Portraits and other Illustrations. 8vo. 12s. net. A SYSTEM OF APPLIED OPTICS. BEING A COMPLETE SYSTEM OF FORMULE OF THE SECOND ORDER, AND THE FOUNDATION OF A COMPLETE SYSTEM OF THE THIRD ORDER, WITH EXAMPLES OF THEIR PRACTICAL APPLICATION. By H. DENNIS TAYLOR, Optical Manager to T. Cooke and Sons, Ltd., of London, York, and Cape Town. 4to. NEW WORK ON ASTRONOMY BY SIMON NEWCOMB. A COMPENDIUM OF SPHERICAL ASTRONOMY. 30s. net With its Applications to the Deter mination and Reduction of Positions of the Fixed Stars. By SIMon newcomb. 8vo. 12s. 6d. net. AN INTRODUCTION TO ASTRONOMY. Illustrated. Crown 8vo. 55. net. SCHOOL WORLD." It contains a clear and accurate account of the present position of astronomical science, and should appeal to students who do not wish merely to be entertained or amazed with diffuse descriptions of wonders and marvels of the heavens, but prefer to digest precise statements of principles, methods, and results." PRACTICAL EXERCISES IN CHEMISTRY. By G. C. DONINGTON, M.A., Senior Science Master of Leeds All the subjects included in the new syllabus in Chemistry for the Matriculation Examination of the University of London are dealt with in thi sbook. THE ANNUAL OF THE BRITISH SCHOOL AT ATHENS. No. XI. Session 1904-5. Crown 4to. 21s. net. The Contents include:-The Palace of Knossos and its Dependencies: Provisional Report for 1905. By A. J. EVANS. — Honorary Statues in Ancient Greece. By M. K. WELSH.-Boundary and Mortgage Stones. By H. J. W. TILLYARD.-A Visit to Skyros. By R. M. DAWKINS.-Laconia: Excavations at Angelona, Geraki, Thalamae, &c. By A. J. B. WACE and F. W. HASLUCK.-—A Votive Relief to Asclepius. By G. P. BYZANTINOS.-An Apollo Inscription from Delium. By Prof. RONALD BURROWS. - Palaikastro: Excavations in 1905. By R. M. DAWKINS, R. C. BOSANQUET, and C. H. HAWES.-Cretan Palaces and Aegean Civilisation. By D. MACKENZIE, &c. For the New Syllabus of the Preliminary Examination for the Certificate (1907). LESSONS IN SCIENCE. A Preliminary Course of Physics and Chemistry. By Professor R. A. JUST PUBLISHED. A SCHOOL GEOMETRY. Parts I and II, with an Introductory Course of Experimental and Practica) Work. Part I. Lines and Angles, Rectilineal Figures. Part II. Areas of Rectilineal Figures. By H. S. HALL, M.A., and F. H. STEVENS, M.A. Crown 8vo. A MANUAL OF GEOMETRY. 2s. 6d. By W. D. EGGAR, M.A., Assistant Master at Eton College. An experimental treatment of Geometry, in which Theorems are taken along with the practical work. NATURE..--" We know of no text-book of elementary geometry which can be more confidently recommended to teachers, and none from which students are likely to derive more profit." KEY JUST PUBLISHED. AN INTRODUCTION TO PRACTICAL GEOGRAPHY. By A. T. SIMMONS, B.Sc., and H. RICHARDSON, M.A. 3s. 6d. KEY, 3s. 6d. FROM THE COTTON FIELD TO THE COTTON MILL. A Study Transition in North Carolina. By HOLLAND THOMPSON. Crown 8vo. 6s. 6d. net. Study of the Industrial |