DESCRIPTION. 7 



the amounts of oxygen consumed could not be made. It was believed 

 that with accurate determinations of the quantities of the other elements 

 the quantity of oxygen consumed could be approximately estimated by 

 difference, and in one of the reports above mentioned such estimates 

 were made according to the method elaborated by Rosa. 1 It is obvi- 

 ously much more desirable, however, to be able to make the oxygen 

 determinations directly, the same as those of the other elements. Asa 

 result of some eight years of experimenting with the apparatus above 

 referred to, plans were gradually evolved for attempting the measure- 

 ment of the amount of oxygen consumed by men, and thus obtaining 

 data for the calculation of the respiratory quotient. To do this involved 

 considerable modification of the form of apparatus and the addition of 

 several new accessory devices. 



Concurrently with the devising of the above modifications, many 

 appliances were developed to insure greater accuracy in the measure- 

 ments of heat and to extend the range of the calorimeter sufficiently to 

 afford means of measuring heat at the rate of 600 calories per hour. 

 These fundamental changes extend to all parts of the respiration calo- 

 rimeter, which is consequently so modified in form and principle from 

 what has been previously described as to render it a new apparatus and 

 to call for a new description. 



It is the purpose of the present publication, therefore, to describe in 

 detail the respiration calorimeter as now used. In this description the 

 two functions of the apparatus will be treated separately first the 

 respiration apparatus, and second the calorimeter. Preliminary to 

 these sections is a description of the laboratory in which the respira- 

 tion calorimeter is installed. 



DESCRIPTION OF LABORATORY AND ARRANGEMENT OF APPARATUS. 



The respiration calorimeter here described is located in a room in the 

 northeast corner of the basement of a large stone building, known as 

 Orange Judd Hall, of Wesleyan University, at Middletown, Connecti- 

 cut. The north and east sides of the room are the masonry of the 

 building, about 75 cm. thick. On the south side of 'the room is a brick 

 partition, about 42 cm. thick, through which are three openings, one 

 with a door opening into a small room, and the other two leading to 

 an alcove. The west side of the room is a wooden partition with a 

 door and a large glass window. The wooden floor is laid on cement. 



There are three windows on the north side, about 130 cm. wide and 

 150 cm. high, and two windows on the east side, about 130 cm. wide 



1 Physical Review (1900), 10, p. 129. 



