TRANSMISSION OF INDUCED EYE-DEFECTS 181 
the first injection of the sensitized serum was given. It will be 
observed that the dosage was considerably smaller than that 
given in experiment 10. On March 7th rabbit 22 bore five 
young, all with eyes apparently normal. Rabbit C had five 
young March 9th. The eyes of these young did not open as 
soon as those of young do normally, and when finally open the 
eyeballs appeared to be somewhat flattened. In three of these 
young the characteristic reddish color of the albino’s eye was no- 
ticeably less intense. The mother died April 13th and three of 
the young some days later. The lenses of one of these, examined 
immediately after death on May 11th were found to be pasty 
and milky-looking. Rabbit 17 bore three young March 16th, all 
with normal eyes. Rabbit A gave birth to five young on March 
22nd. She had not made a suitable nest for them, however, and 
when found next morning all were badly chilled. Although 
placed in an incubator, all died except one. The eyes of this 
survivor were found to be normal when the lids finally opened. 
Experiment 15 
Three fowls and two rabbits were used, As shown in table 3, 
no young were secured. Rabbit A after four doses of serum de- 
veloped paralysis of the hind legs and died June 22nd. Rabbit 
20 was obviously pregnant, but the young were killed in utero 
apparently by the later injections. She was ill for some time 
and although used in later experiments she proved. infertile. 
We have found infertility to be a common experience following 
deaths of young in utero. Apparently the resorption is so pro- 
longed that the uteri remain blocked for a long time or else 
changes are set up in the uteri which either obstruct them or 
otherwise prevent conception or placentation. In rabbits which 
abort their young, on the other hand, we have had little difficulty 
in securing young within a short time afterward. For example, 
rabbit 17 (tables 4 and 5) apparently aborted some of her young 
on January 5th, but following another mating she had five young 
April 5th. 
