380 MINOT. [VoL. II. 
II. MAN. 
The following observations are of a fragmentary character, 
but may serve to round out our information in certain respects. 
Some of the facts have already been recorded in the series of 
numerous embryological articles contributed to Dr. Buck’s Ref 
evence Handbook of the Medical Sciences ; but as that work is 
for consultation rather than the publication of original observa- 
tions, it will hardly seem a mistaken repetition if I include here 
some things already published there. 
§ 13. Allantois and umbilical cord.— Prof. W. His has 
shown that the entodermal cavity of the allantois is the termi- 
nal stretch of the entodermal canal; the posterior end of the 
body is prolonged into a mass to which he gives the name of 
“ Bauchstiel” (Anatomie menschlicher Embryonen, IIl., 222- 
226), and which develops in the same general manner as the 
Cut 2.— Diagrammatic section of the Bauchstiel of a human embryo, modified 
from W. His. Am, amnion; md, medullary groove; v, v, veins; A, A, umbilical 
arteries; A//, allantois; coe, coelom. 
body proper, having a rudimentary medullary groove, a somato- 
pleure and splanchnopleure, Cut 2. It is morphologically the 
hind portion of the body. After its closure and separation from 
the amnion it appears as the umbilical cord. Its development 
requires that the umbilical cord should be covered, not by the 
amnion, as it is almost universally stated, but by an extension 
of the foetal epidermis. Histological examination shows that 
this is the case. The amnion is characterized by the ectoderm 
remaining a single layer of cuboidal or low cylinder cells, and by 
the matrix of mesoderm being distinct, owing to its high refran- 
