428 J. F. MeClendon. 
The development of the operated eggs was very similar to that 
of the normal, and quite different from that of the uninjured blasto- 
meres in Roux’s experiment. The remaining blastomere rounded 
up gradually after its partner had been removed, and the blastula, 
gastrula and later stages were wholes of half size. As the mortality 
was great, it is to be expected that defects would be observed in 
many of the specimens, but these defective specimens could not 
be interpreted as half embryos. The only defect that I could 
observe in the oldest specimen was the small size of the suckers, 
Fig. 1 Fig. 2 
Fig. 1. Chorophilus triseriatus: a section of the left eye of a tadpole developed 
from one of the first two blastomeres. 
Fig. 2. A section of the right eye of the same tadpole as in fig. 1. 
before the pericardium began to swell so that the heart beats 
could no longer be observed. 
Sections confirmed the observations on the living material 
and showed that the embryos were complete and not half- 
forms. 
Figs. 1 and 2 represent the right and left eyes seen in transverse 
sections of the eight day larva. The right eye lacks a lens, and 
the left eye is not quite normal, yet these defects make no ap- 
proach to those of a half-larva since they are not very extensive 
