EXPERIMENTS WITH ALCOHOL 133 



iiig the pangs of thirst. As a matter of fact, the fluid con- 

 sumption of the birds so treated was very great!}' reduced below 

 that of the untreated controls. On the other hand, the inha- 

 lation method gives very satisfactory results with poultry, just 

 as it has with guinea-pigs. 



In the present experiments inhalation tanks of two different 

 sizes have been used. The general form and appearance of one 

 of these tanks is shown in text figure 3. 



The general plan of construction of these tanks will be evi- 

 dent from figure 3. They are essentially square boxes of gal- 

 vanized iron, having at the top a round opening which serves 

 as a means of entrance and exit for the bird. This opening is 

 tightly closed by a cover during an experimental treatment. 

 Below the bottom of the tank is a cylindrical reagent chamber 

 closed by a tight fitting cover from below. In this projection 

 below the floor of the tank proper is placed absorbent cotton 

 saturated with the particular reagent used. Over the top of 

 the reagent chamber is placed a piece of heavy gah'anized wire 

 gauze of about half-inch mesh which serves to complete the 

 floor of the inhalation compartment proper, without obstructing 

 the diffusion of the fumes from the reagent chamber. 



The dimensions of the tanks used are as follows : Large tank : 

 length 2 feet, width 2 feet, height 21 inches, top cover hole 

 15 inches in diameter. The reagent chamber at the bottom is 

 8 inches in diameter and 6 inches deep. The window in front 

 is 15 J by 9 inches. These large tanks have a capacity of four 

 or five birds at one time. The \'olume of contained air in one 

 of these large tanks amounts to something OA'er 7 cubic feet. 



The small tanks have the same dimensions as the large ex- 

 cept in the following particulars: length 18 inches, width 18 

 inches, window in front 12 by 9 inches. These smaller tanks 

 will accommodate two or three birds. The volume of con- 

 tained air in one of these small tanks is about 4 cubic feet. 



No special arrangements have been found necessary in these 

 tanks for ventilation. The number of birds treated in any one 

 tank at a time is kept down to the point where they could exist 

 for a long time without any discomfort owing to exhaustion of 



