EFFECTS OF THIRST — ALBINO RATS 417 



lungs, trachea, and pharynx, in a dog on dry diet with loss of 20.7 

 per cent in body weight. Bowin ('80) concluded that the 

 changes in the weight of the lungs in dogs and rabbits on dry 

 diet are the same as during total inanition. 



In rats after inanition with water, Jackson ('15) found an 

 apparent loss of 30.9 per cent in the lungs of the acute series and 

 40 per cent in the chronic series, which was roughly proportional 

 to the loss in body weight. He cites previous observations by 

 others indicating that the loss in weight of the lungs during inani- 

 tion (with or without water) is usually less than that of the body. 

 McCarrison ('19) has likewise noted a decrease in the weight of 

 the lungs in monkeys on vitamine-deficient diets. 



Parotid and submaxillary glands 



The parotid glands are easily removed and separated from the 

 adjacent lymphatic nodules and facial nerve. The submaxillary 

 glands were similarly isolated. The adjacent lymphatic glands 

 sometimes appeared enlarged in the test rats, in contrast with the 

 salivary glands. The weights of the submaxillary glands in the 

 controls were a little heavier than those given by Hatai ('18). 



The parotid glands in the acute-thirst series show a loss of 

 57.6 per cent in average weight (table 2) and in the chronic- 

 thirst series a loss of 69.7 per cent. In the rat (Si. 2) on total 

 inanition (table 1) the apparent loss in the weight of the parotid 

 glands is 67.7 per cent. The submaxillary glands similarly lose 

 47.1 per cent in average weight in the acute-thirst series, and 64.5 

 per cent in the chronic-thirst series. In the rat (Si. 2), after 

 total inanition, the apparent loss in weight of the submaxillary 

 glands is 63.3 per cent. 



Thus the salivary glands during thirst and after total inanition 

 evidently undergo a profound atrophy, decreasing in weight rela- 

 tively more than the body as a whole. Falck and Scheffer ('54) 

 similarly found a loss of 33.7 per cent in the weight of the salivary 

 glands in a dog on dry diet with loss of 20.7 per cent in body 

 weight. McCarrison ('19) finds an atrophy of the submaxillary 

 glands in monkeys on vitamine-deficient diets. 



