184 M. F. GUYER AND E. A. SMITH 
they must have entirely disintegrated. No. 16A1 had four 
young January 7th, all with normal eyes apparently. In the 
case of no. 17 one live young and what appeared to be two good- 
sized placentas without any trace of young attached to them 
were found on the morning of January 5th. The mother was 
gnawing at one of the placentas, and it was possible that young 
had been attached to the placentas originally, but had been 
eaten. The single live young one was not taken care of by the 
mother and soon died. The doe, although a good mother on 
previous occasions, had plucked out none of her hair nor other- 
wise prepared a nest for the coming of this litter. She appar- 
ently had no milk or at least made no attempt to suckle the young 
one that survived, although it was very active and insistent for 
a few hours. It is an interesting incident that this same doe in 
preparing a nest for her next litter which was born April 5th, 
denuded herself entirely of hair as far as she could reach along 
her belly and sides so that she looked almost like a hairless rab- 
bit. The nest was a huge mass of fur. 
Experiment 21 
Six fowls and five rabbits were used (table 5). It was thought 
that possibly a more active serum might be obtained if the anti- 
gen were introduced intravenously into the fowl instead of intra- 
peritoneally. Accordingly, two of the injections of pulped lens, 
the second and third, were made into the femoral vein. The 
first and fourth were subcutaneous and the fifth was intraperi- 
toneal. Two of the rabbits, nos. 14A5 and 1444, bore no young. 
No. 18A2 aborted five young April 1st and died April 9th. No. 
17 bore five young April 5th, the‘eyes of which were normal, at 
least to all outward appearances. No. 16A1 had four young 
April 6th. Both eyes of one of these (fig. 2) were markedly 
abnormal. Unfortunately, it died May 11th. The eyes of the 
other young in the litter appeared to be normal. No. 16A1 had 
been mated to a brother, 16A2. They were from a Minneapolis 
strain of rabbits. 
