216 CAROLINE M. HOLT 
TABLE 10. SERIES B 
Test animals 
Stock albinos underfed from birth. Under two months old 
RATS AGE CENT OF RANGE 
WEIGHT WEIGHT 
days gm. mm. gm. gm. 
Grmaless es eee | cael eee 86 1.114} 0.036} 3.19 | 3.06-3.38 
ASTemaAles: toe eee ae 24-53] 15.6 79 1.062} 0.033} 3.08 2.11-3.82 
Averages for males and 
fomiBlosaserss cet ese fake 18.1 |; 83 | 1.091) 0.034) 3.14 
TABLE 11. SERIES B 1. 
Test animals 
Stock albinos underfed from birth. Over two months old 
BODY BODY BRAIN TORY 
tas NER WEIGHT|LENGTH| WEIGHT! BULBS pe ei BENGE 
WEIGHT WEIGHT 
days gm. mm, gm. gm. 
SMOMBLER =. 2 tks 6h ohare sizes 77 | 31.2 | 102 | 1.437) 0.050) 3.48 | 3.15-3.93 
days old when they were killed and examined. The other 
eight sick rats of this Series C were individuals showing a con- 
siderable infection of the lungs, and one of these (No. 20) had, 
in addition, a large abscess of the liver. 
All of these rats were examined in the same way as those of 
Series A. 
a. Results. In the group of sick animals, those with the 
intestinal infection had, at one hundred and thirty-four days, 
bulbs which averaged 0.050 gram or 3.02 per cent of the total 
brain weight (table 12, group 1) while a set of normal individuals 
of practically the same age gave an average of 0.073 gram or 
4.32 per cent of the total brain weight (see table 20, group of 
females). These results seem especially interesting because 
here the adverse conditions appeared only after the rats were 
well grown—eighty days old—and lasted only about ten days. 
The remaining two groups of sick rats all had infected lungs 
and were very old when killed. The two males had bulbs 
