206 PROCEEDINGS : BOSTON SOCIETY NATURAL^HISTORY. 
of a human embryo, the same organ the medullary portion of which is 
represented in Fig. 
264 of my “ Human 
Embryology” where 
also, p. 488, I have 
briefly indicated the 
disposition of the 
blood vessels in the 
following words: — 
“ In the cortex. . . . 
the cords are marked 
off by wide capilla¬ 
ries, with distinct 
endothelial walls, 
between which and 
the supra-renal 
cords there appears 
to be no connective 
tissue, although in 
the medulla there is 
more or less connec¬ 
tive tissue developed 
early around the ves¬ 
sels.” M. Pfaundler, 
’92.1, has shown 
that the connective 
tissue capsule in cer¬ 
tain adult mammals 
sends prolongations 
into the cortex, but 
these are so slightly 
developed that even 
in the cortex most 
Fig. 10. Supra-renal of a human embryo of about 0 £ £] ie pp )0f j spaces 
four months, vertical section of the cortex. A, outer, , ,.,,, 
~ 0 . . ., . have very little or 
B, inner zone; Cap, capsule ; St, Si, sinusoids, m 17 . 
which a few blood corpuscles have been represented, no connec ^ lve f lssue 
to indicate the width of the blood spaces. about them. 
In the supra-re- 
nals of rodents the sympathetic 1 medullary portion is very promi- 
1 According to Aicliel (Anat. Anzeiger, xvii, 1900, p. 30), the medulla does not arise 
from the sympathetic. 
