EFFECTS OF THIRST — ALBINO RATS 411 



ture, respectively: acute inanition, body -33.9, musculature 

 -30.9; chronic inanition, body -36.1, musculature -40.8. 

 Results of other investigators cited by Jackson support the con- 

 clusion that in general the loss of weight in the musculature dur- 

 ing inanition is roughly proportional to the loss in body weight, 

 with a tendency to relatively greater loss during chronic inani- 

 tion. This is in general agreement with the results of thirst, as 

 above given. 



Viscera and 'remainder' 



In the visceral group (tables 1 and 2) have been included the 

 brain, spinal cord, hypophysis, eyeballs, parotid, and submaxil- 

 lary glands, as well as the thoracic and abdominal viscera. 

 The visceral group in the acute-thirst series shows a loss of 30.6 

 per cent in average weight and in the chronic-thirst series 42.2 

 per cent. This is relatively somewhat less than the corresponding 

 loss in body weight. Thus the relative (percentage) weight of 

 the visceral group is not much changed, although (as will appear 

 later) there is great variation in this respect among the individ- 

 ual organs. 



The 'remainder' includes that which remains after dissecting 

 from the rat body the skin, skeleton, musculature, and the 

 visceral group mentioned above. It does not include the escaped 

 blood and other fluids. It includes the dissectable fat tissue, 

 mesentery, some nerves and vessels, a few small unweighed 

 organs, and lymphatic glands. The latter were apparently 

 enlarged in some of the test rats. 



The 'remainder' shows a loss of 72.7 per cent in average weight 

 in the acute-thirst series and of 88.8 per cent in the chronic series. 

 In the rat (Si. 2) on total inanition (table 1) the corresponding 

 loss in the 'remainder' amounts to 77.8 per cent. This loss is 

 undoubtedly due chiefly to the loss of fat, which has almost 

 disappeared in the test rats. 



