122 CARNEGIE INSTITUTION OF WASHINGTON. 



with slate treads. The first floor comprises four rooms for small 

 mammals and one for sheep ; also two suites of rooms whose walls 

 are all insulated with cork, to be used for heat and cold experiments. 

 This floor also has a room for aquatic animals, a kitchen for preparing 

 food and sterilizing small dishes, and a small suite of rooms for an 

 animal caretaker. The second floor comprises the chemical labora- 

 tory, 24 by 20 feet, with a weighing-room; a bird-room, 30 by 20 feet; 

 a suite for operating, an adjacent hospital and laboratory, all together 

 40 by 18 feet; two laboratories, each 18 by 19 feet; a museum room, 

 14 by 11 feet; a dark room 22 by 8 feet; a fire-proof vault for records. 



MISCELLANEOUS. 



Our frame carpenter shop and the lumber shed were moved from 

 their old sites to make room for the power-house, and set against 

 the side hill. A retaining wall about 80 feet long and 6 feet high 

 was built against the face of the slope. The excavated material 

 was deposited upon the salt marsh and a full half acre has been thus 

 reclaimed, which will be added to the garden. 



A water tower 50 feet high and a tank of 10,000 gallons capacity 

 were installed and pipes laid to and from them. Two hydrants were 

 placed and provided with hose. A stream of water can be thrown 

 to the ridge of the laboratory and the animal house. The tank is 

 kept filled by the ram at an expense of less than $10 a year, including 

 new rubber valves and labor in replacing them. 



