766 



rinsiowGiCAL sn dies of the rlefed crolse 



obvious that Group B females suffered the largest percentage weight loss and consumed on 

 the average less water per hour than all other birds. Furthermore those individuals con- 

 suming the least amount of water suffered the greatest loss in body weight. 



350 



i + b water- a+ Co^'^ 



GRAMS 

 .700 



650 



24 48 72 96 120 144 168 192 



DURATION OF TEST IN HOURS 



216 



240 



600 



550 



500 



450 



4O0 



350 



FICURK '>2. TRENDS OF 24-HOUR CHANCES IN BODY WEICHT OF ADULT GROUSE DURING 

 PROI.ONCEn F\STIN'C. WITH AM) WITHOUT WATER 



Analysis of data from 16 observations on the relationship between water consumption anil 

 change in body weight were calculated statistically as follows:'" 



Predicting equation: V 103.25 \X)H^^\ 



(Correlation coenicicnl: Ixxy -= —0.65 ± 0.15-1 I standard error! 



Since the \aliic of llic <orrelation coefficient is both high and negative it indicates that with an 

 increase in the aiiioiiiit of water consumed there is a decrease in the amount of weight loss. 



Length of Time for Food to Digest 



Experiment 8 involved a determination of the length of timi' required for food to digest 

 and pass through the alimentary canal under different conditions of air temperature. Beyond 

 this, comparisons were made between fasting birds and others whose feeding had not been 

 interrupted. A small gelatin capsule containing solid food particles and a small quantity 

 of speciallv prepared powdered scarlet dye was itiserted into the crop. The rate of digestion 

 was calculated as the time elapsing between feeding the capsule and the first appearance of 



