Proceedings of the Association of American Anatomists XIII 
The lens, then, is not a self-originating structure, but is evidently de- 
pendent upon the stimulus of the optic vesicle for its origin. It seems 
that this influence of the optic vesicle upon the overlying ectoderm must 
be of considerable duration, and that even after lens formation has begun, 
a continued influence of the optic cup is necessary for the normal differ- 
entiation and growth of the lens. 
ON THE RELATION OF THE NERVE ENTRANCE TO THE INTERNAL 
ARCHITECTURE IN MAMMALIAN MUSCLE. By CuHartes R. Bar- 
DEEN. Department of Anatomy, University of Wisconsin. 
SOME NEW FACTS TOUCHING THE ARCHITECTURE OF THE SPINAL 
GANGLION IN MAMMALS. By S.. WALTER RANnsom. Neurological 
Laboratory, University of Chicago. Presented by H. H. Donaldson. 
There are in the second cervical ganglion of the white rat about three 
times as many cells as there are medullated afferent fibers (8500 cells, 
2500 fibers). Nevertheless, section of the nerve caused the disappearance 
of half of the cells from the ganglion; that is, about 4500 cells dropped 
out following the section of 2500 medullated afferent fibers. This result 
was constant in the nine cases enumerated. In spite of this large and very 
constant reduction in the number of the ganglion cells there was but a 
slight and inconstant decrease in the number of medullated fibers in the 
dorsal roots. 
It is clear that the present conception of the architecture of the spinal 
ganglion does not furnish an adequate basis for the explanation of these 
results. 
GLYCOGEN IN A 56-DAY HUMAN EMBRYO AND IN PIG EMBRYOS OF 
7 TO 70 MM. By Srtmon H. Gace. Department of Histology and Em- 
bryology, Cornell University. 
A 56-day human embryo preserved in 95%. alcohol showed abundant 
glycogen in the tissues where it is most prominent in the lower mammals 
of corresponding stages. It was especially marked in the developing 
epidermis, in the cartilages and in the skeletal muscles. It was also 
abundant in the epithelium of the main air passages, but scanty in the 
heart. 
For comparison pig embryos ranging from 7 to 70 mm. were preserved 
in 95%, alcohol and cut into serial sections. As they were placed in the 
alcohol before any changes had supervened, the glycogen was more sat- 
isfactorily preserved than in the human embryo which had macerated 
somewhat before the alcohol penetrated the chorion. 
