DESCRIPTION. 9 



For protection against severe changes of external temperature during 

 the winter months, double windows are provided. The room is heated 

 by steam- pipes near the ceiling and by gas stoves. Two ventilating 

 fans belted to the main shaft have their blades so adjusted that the 

 warm air at the top of the room is continually forced down. It is pos- 

 sible to keep the temperature of the room comfortable for work, but 

 the regulation is far from that of a constant-temperature room. That 

 accurate calorimetric work can be done in a room with such an uneven 

 temperature is because of the peculiar construction of the calorimeter, 

 as described beyond. The general plan of the laboratory room is 

 shown in figure i. 



The room is entered by the door near the southwest corner. The 

 door near the southeast corner leads into a small annex used for a 

 kitchen, and containing ice-chests and tanks. The two other openings 

 in the south wall lead to an alcove used as a tool and supply room. 



The respiration chamber is .seen in about the middle of the north 

 side of the laboratory, separated from the north wall by an air-space 

 of about 75 cm. As may be seen in figure 2, the wooden walls sur- 

 rounding the chamber extend from floor to ceiling. To the south of 

 the respiration chamber, about in the center of the laboratory, is the 

 long table on which are the rotary blower for maintaining a current of 

 air through the apparatus, the absorbers for removing the water vapor 

 and carbon dioxide from the air current, and the appliances for the 

 introduction of oxygen. Suspended from the ceiling at the north 

 side of the laboratory is the shafting by which power from the electric 

 motors on the west side is transmitted to the water-pump and the rotary 

 blower. 



The small table at the west of the chamber is convenient for the 

 deposit of articles to be passed into or out of the chamber through the 

 aperture just above it. At the east end of the chamber is the observer's 

 table, and just beside this is the water-meter. Around the walls of the 

 laboratory at convenient points are desks, tables, balances, sink, etc. 

 Near the door entering the laboratory is a barometer, securely attached 

 to stanchions and well isolated from sudden changes in temperature. 

 The rack in one of the entrances to the alcove at the south is for storing 

 extra carbon-dioxide absorbers. 



The disposition of the apparatus and accessories in the room was 

 made with a view to facilitating manipulation and to conform to the 

 previously existing shape and construction of the laboratory room, 

 which was in no sense peculiarly adapted for calorimetric work. 



A general view of the laboratory room, taken from the southeast 

 window, is shown in figure 2. 



