OLFACTORY BULBS OF THE ALBINO RAT Zils 
TABLE 8. SERIES A 
Final control animals 
Stock albinos kept on normal diet for fifty-nine days or more, after weaning at 
four weeks 
OLFAC- eee 
nas non | BOBE,| BORE, | Beare | TORE, loss or] RANGE 
Vrnikenste WEIGHT 
days gm. mm. gm. gm. 
Grmiales.-... cease. cae. | 2 200 4 199) FA s80602078| 4:29. (381-4773 
AREMB eB... Bete see 1361| 157.0] 181 | 1.706) 0.074) 4.32 | 4.03-4.62 
Averages for males and 
Git Las AMER by BHC oe 186.7| 193 | 1.772} 0.076) 4.30 | 3.81-4.73 
Test 
Summary = es oss de. 63% | 85% | 77% 
Control 
1 This higher average age for the female controls is due to the fact that one 
female was kept for breeding purposes until two hundred and thirteen days old. 
As all her measurements were practically identical with those of another female 
of same litter, one hundred and fifteen days old, the record was included in the 
table. 
mothers which were bearing or nursing the young to be tested. 
Consequently nine pregnant females were selected. A few 
were put on a corn diet several days before the birth of the young, 
but most of them began the corn feeding on the day of the birth 
of the litter. The young rats were weaned at three weeks and 
fed exclusively on corn. 
It is intended to carry out this experiment more extensively 
at some future time but enough amimals were tested to give 
significant results. It was found very difficult to raise such 
litters, for two reasons. In the first place, after the young reached 
an age to leave the nest, the mother was very apt to kill the 
entire litter. This, apparently, was not because of hunger, for 
in all but two cases in which the young rats were partially eaten, 
the animals were mutilated only to the extent of a bite through 
the cerebellum, and sometimes through the front of the throat. 
It has been suggested that the increasing demands of the young, 
coupled with an inadequate milk supply, may have been the 
cause of this unnatural behavior of the mothers. 
