10 A RESPIRATION CALORIMETER. 



In figure 2, the table supporting the absorbing system, the rotary 

 blower, and the apparatus for the introduction of oxygen appear in the 

 center of the foreground. The respiration chamber in its wooden cas- 

 ing, with the glass door in the east end, is immediately at the right, and 

 adjacent thereto are the observer's table and water-meter. The air- 

 pipes conducting air to and from the respiration chamber are suspended 

 near the ceiling and extend across the front end of the chamber. At 

 the left, securely attached to the brick wall, is the balance for weigh- 

 ing the absorbing apparatus. In the rear and immediately at the right 

 of the door is the barometer closet attached to two stanchions. 



Another general view of the laboratory, showing more of the detail 

 of the respiration chamber, is given in figure 3. The door of the res- 

 piration chamber is open, thus showing a little of the interior. The 

 observer's table, water-meter, and galvanometer hood are at the right, 

 and at the left the absorbing apparatus, rotary blower, and balance are 

 shown. 



A view taken from near the sink, figure 4, shows the rear end of 

 the chamber. In the center of this end of the chamber is the opening 

 through which the food and excreta are passed, shown here with the 

 outer door open. On the table immediately beneath it are character- 

 istic vessels used to introduce or remove material from the chamber. 

 The absorbing system is shown immediately at the right. On the end 

 of the absorbing-system table are seen the two pans with rubber dia- 

 phragms (one of which is distended) which are used to indicate apparent 

 changes in volume of air in the whole system. Farther at the right is 

 seen the water-pressure regulator standing in [the arch leading to the 

 alcove room used for storing apparatus. 



The details of the absorbing system are better shown in figure 5, 

 which was taken from a position in the alcove room near the water- 

 pressure regulator shown in figure 4. The smaller of the two pipes 

 near the ceiling at the right conducts the air from the respiration 

 chamber to the rotary blower. The blower forces the air through the 

 absorbers on the table. The air, freed from carbon dioxide and water 

 vapor, then passes upward to the pipe lying on the top shelf of the 

 table, to which the two pans are attached. To the right of the pans 

 the oxygen is supplied to the air in this pipe from the cylinder with a 

 large U tube attached to it, standing upright near the center of the top 

 shelf of the table. After being supplied with oxygen the air proceeds 

 along the horizontal pipe to the end of the table, where it passes through 

 the vertical section, and thence along the ceiling around the corner 

 of the chamber, entering it immediately at the left of the observer's 

 table. The small tubes and the Elster meter at the right, on the top 



