90 STORRS AGRICULTURAL EXPERIMENT STATION. 
Numerous passages through the wooden and metal walls are 
needed for tubes to convey the ventilating current of air; wires 
for various electric connections; and the aperture (“‘food 
tube’’) for passing the food and drink into the apparatus and 
taking out the solid and liquid excretory products. ‘The tubes | 
through which the currents of air (‘‘ ventilating tubes’’ ) pass 
have an internal diameter of 4 cm. (1% in.). The food aper- 
ture is of copper and has an internal diameter of 15 cm. (61n.). 
It is situated on the left side of the apparatus (see diagram ) 
and is provided with a cap at each end. ‘The outer cap is 
attached by a screw so that it may be closed air tight. 
putting in the food and other materials the cap is taken off, 
the receptacle containing the food is placed in the tube and the 
cap put on again. A signal is then given to the man inside 
who removes the inner cap and takes out the receptacle. The 
materials from within are passed out in corresponding manner, 
In this way there is no danger of ingress or egress of any con- 
siderable quantity of air. | 
A wet and dry bulb hygrometer, capable of being read to 
hundredths of a degree centigrade is hung in the rear of the 
chamber and observations are made by the occupant, generally 
at intervals of two hours, during the period of the experiment. 
These observations are reported by the telephone and show the © 
hygrometic condition of the air inside the apparatus. 
The furniture used in the experiments here reported con- 
sisted of a light, folding canvas cot bed; a folding chair; and a 
folding table. Such clothing and bedding as were needed for 
comfort were taken in by the man at the beginning of the ex- 
periment and small articles were passed in and out through the 
food tube at convenient times. ‘The floor was protected by 
carpeting. The amounts of water held by the furniture and 
clothing, etc., were determined as accurately as practicable by 
weighings at the beginning and end of each experiment. 
APPARATUS FOR MEASURING AIR AND TAKING SAMPLES FOR 
ANALYSIS. 
The essential features of a respiration experiment are the 
maintenance of a proper current of air, the accurate measure- 
ment of its volume and the determination of the respiratory 
products. ‘The air was drawn through the apparatus by means 

