TRANSMISSION OF INDUCED EYE-DEFECTS 197 
obtained through the use of unsensitized fowl serum or of fowl 
serum sensitized to other rabbit tissues than crystalline lens, as 
by means of fowl serum containing rabbit lens antibodies. 
But when our experiments with fowl serum sensitized to rab- 
bit crystalline lens are compared with our controls, it will be 
noted that eye defect appeared only in the young of mothers 
injected with the serum sensitized to rabbit lens. Leaving out of 
account the uterine dead, aborted young, and young which died 
RR 2 
23AL LIAR LIAB RIA4 =—RBAS | 23A6 
defective d d 
EVE Of 
right side 
diéd 
Fig.4 Female 22, after mating with male 2, was treated with lens-sensitized 
fowl serum; all of the resulting young (23A series) were normal. When 23A5 
and 23A6 were bred together, however, an individual with a defective right 
eye was born. See figure 5 for explanation of symbols. 
before the eyelids separated, but counting the young obtained 
in the experiments recorded in our earlier paper (718), 61 young 
were obtained from mothers treated during pregnancy with lens- 
sensitized serum. Of these, 4 had conspicuously defective eyes 
and 5 others had eyes sufficiently different from normal eyes to 
be recorded as abnormal, and therefore probably due to the 
effects of the sensitized serum. In one instance, although the 
immediate young of a mother treated with lens-sensitized serum 
seemed unaffected, they begot one young one with a defective 
right eye (fig. 4). From mothers treated with pure fowl serum 
