of absolute alcohol is made. Microscopical supplies and expensive reagents may be purchased at the laboratory. The station does not supply microscopes or other instruments. A list of the free equipment is furnished and a copy of the "Regulations for the working of the laboratory" is sent on application. Each investigator is allotted a part of the tank space in the main laboratory. The association does not permit naturalists to make zoological collections at the station, but provides these for sale at fixed prices. Price lists are sent on application. No charge is made for material collected by investigators for personal use, beyond that for containers and packing. A collection of named specimens available for reference and for use in identification of material is found in the station. All investigators are expected to furnish to the director, upon the completion of their work in the laboratory or within three months thereafter, a summary suitable for publication in the "Journal."

The station is open throughout the year and its facilities are available for all equipped investigators on application to the director. Seven days' notice is expected. The best season in the matter of collecting facilities is from March 15 to September 30. Pleasant lodgings at moderate prices and good hotels are to be found within a short distance of the station. American investigators find a cordial welcome at Plymouth, a mild climate, and much of interest and diversion in the vicinity.

The Plymouth station occupies a commanding position adjacent to the citadel overlooking the sound, at the end of the famous promenade, "The Hoe," with its statue of Sir Francis Drake and the Eddystone light tower. It stands near the edge of a sloping rocky cliff at an elevation of 95 feet above sea level. Its grounds (240 by 265 feet), granted to the association by the war office, occupy the whole length of King Charles Curtain and have an area of about 63,600 square feet. A road lies between this plat of land and the sea, and private access to a small section of the seaboard is provided for by means of a tunnel 7 feet 6 inches high and 6 feet 6 inches wide, which leads from the area surrounding the cellars, beneath the road to the rocks below.

The building is placed 90 feet from the wall of the citadel, and is about 60 yards from high water mark. It is in the form of two blocks, which are each 34 feet 6 inches long by 42 feet wide and three stories high (40 feet), and a central connecting portion 70 feet long by 34 feet 6 inches wide and two stories high (30 feet). The east, south, and west fronts are built entirely of dressed limestone, which has been excavated on the spot; but on the north front the window and door dressings are of brick.

The roof of the central portion is peaked and covered with slate; that of the two blocks is flat and covered with lead.

Below the western block cellars have been excavated 14 feet deep, surrounded by an area 6 feet 6 inches wide on the north and 4 feet

FIG. 13.-Ground plan of Plymouth station, after Heape (1887): a, Sink in receiving room; bb, tables; c, slate-topped table; d, shelves; e, five table tanks, each 9 feet 9 inches long, 2 feet 3 inches wide, 1 foot 9 inches deep; f, tank, 15 feet 6 inches long, 9 feet wide, 5 feet deep; 9, tank, 30 feet 6 inches long, 9 feet wide, 5 feet deep; h, tank, 15 feet long, 5 feet wide, 5 feet deep; j, six tanks, each 5 feet long, 4 feet wide, 4 feet deep; k, tank, 15 feet long, 4 feet wide, 4 feet deep; 1, two tanks, each 10 feet long, 4 feet wide, 4 feet deep; m, pillars to support Dennett's arching; n, manhole into circulating reservoirs along north side; o, trench covered with grating containing hot-water pipes; p, culvert conveying salt water from circulating to main reservoirs; r, raised portion of reservoirs.

PORCH

voirs (figs. 13, 15) for salt water, each 37 feet 6 inches long, 21 feet 6 inches wide, and 13 feet deep, and each capable of holding 50,000

FIG. 14.-First-floor plan of Plymouth station, after Heape (1887): aa, Two sinks in physiological laboratory; b, cupboard with air-tight glass doors; c, sink in
chemical laboratory; d, slate-topped table; e, bench; f, blowpipe table; g, stink cupboard; h, shelves; j, slate-topped table in main laboratory; k, twelve
tanks, each 1 foot 6 inches deep, 2 feet 3 inches wide, 5 feet long; ll. two sinks; m, a "compartment;" n,

sink; o, bench; p, shelves; r, table with

drawers

and cupboards.

gallons. The roof of

a portion of each of the reservoirs is 6 feet higher than the remainder and is fitted with a gangway to enable a man to walk inside. These reservoirs are built of concrete and coated with a special asphalt; they are arched with brick and completely covered over.

The arrangement of rooms in the building is as follows:

Cellars. The cellars (fig. 15) are 13 feet high, and consist of an engine room 20 by 16 feet; a boiler room 20 by 11 feet; an engineer's room 13 by 11 feet, a coal cellar, storeroom, and toilet. Access to the cellars is provided for by means of steps down into the area on the north side. Ground floor, west block.-The rooms on the ground floor (fig. 13) are 12 feet high. The main entrance to the building is in the center of the west face of this block, and leads, on the one hand, by means

of a straight passage 6 feet wide directly into the aquarium, and on the other, by means of a staircase 9 feet wide, to the first floor. On