EFFECTS OF THIRST ALBINO RATS 455 



In adult rats the testes during acute thirst lose about 15 per 

 cent in their weight and during chronic thirst they lose 52.7 per 

 cent, while the loss of the whole body is respectively 36.1 per 

 cent and 52.4 per cent (Kudo, '21). Hatai ('15) found that the 

 testes of young albino rats show an actual loss in weight (23 per 

 cent) as a result of six months on the lipoid free-diet. 



EPIDIDYMIDES 



The apparent losses in the average weight of the epididymis 

 (table 2) are, of course, subject to the same corrections as those 

 of the testis, on account of differences in body weight between test 

 rats and controls. The actual losses are therefore somewhat 

 lower than those indicated in the table and below those of the 

 testis. 



In adult rats during thirst the epididymides lose weight roughly 

 in proportion to the body weight (Kudo, '21). 



OVARIES 



The average body weight of the female rats in the control group 

 (table 2) is slightly lower than that in all the test groups, except- 

 ing the first. But the maximum difference in body weight is only 

 about 10 per cent, so the relatively large apparent losses in the 

 average weight of the ovaries, increasing progressively from 32.5 

 to 66.7 per cent, would not be materially affected by the required 

 corrections. 



This loss in the weight of the ovaries during thirst is materially 

 greater than that (27 per cent) found by Jackson ('15 a) in rats 

 underfed beginning at three weeks of age. Stewart ('19) found 

 practically no change in the weight of the ovaries in underfed new- 

 born rats. Hatai ('15) found in young albino rats fed with lipoid- 

 free diet a loss of 17.4 per cent in the weight of the ovaries. 



UTERUS 



The uterus (including tubes) is subject to considerable varia- 

 tion in weight, as appears in the various test groups in table 2. 

 While the tendency during the earlier test periods is somewhat 

 fluctuating and doubtful, there appears to be a definite increase in 



