WEIGHTS OF UNDERFED YOUNG ALBINO RATS oom 
testes, epididymi (at three and six weeks, loss later), ovaries and 
hypophysis. 
There is no marked change in the weights of the thyroid and 
pineal glands. A marked loss in weight occurs in the lungs and 
especially in the thymus. In the earliest period only (up to three 
weeks) there is a loss in the weight of the spleen and intestinal 
contents. 
In the rats underfed for very long periods (starting at three 
weeks of age), the: well-marked increase is maintained in the 
weight of the spinal cord, eyeballs, and usually of the suprarenals. 
The brain also shows a slight increase. In the case of the 
lungs, however, the apparent increase is of doubtful significance. 
There is apparently no marked change (or inconstant variability) 
in the weights of the intestinal contents, kidneys, ovaries, testes 
(?), and pineal body. The thyroid, thymus, heart, liver (vari- 
able), spleen (variable), alimentary canal (empty), epididymi, 
and hypophysis (in males) usually suffer a loss in weight during 
the long underfeeding periods. 
