G. F. Barker—Physiological Chemistry. 265 
glands of the placenta; birds being a class of animals in which 
the placenta is represented in part by the umbilical membrane, 
in part by the allantois. May it not be asserted therefore, that 
like mammals, birds also have a transitory liver ; especially since 
the inverse relation of this organ to the actual liver is also true 
ofthem? The liver in birds does not act till the 11th or 12th 
day of incubation; and precisely at this time the umbilical 
membrane is replaced by the allantois which contains no glyco- 
genic glands. 
(50.) A second paper by Bernarpd was presented to the 
| Academy on the 14th of April,* on the relation of the glyco- 
, genic matter to the development of certain foetal tissues before 
| the appearance of the liver function. The object of his re- 
searches was to ascertain what particular histological elements 
oe ae 
dine. In this way, the disposition of the glycogenic matter 
i the skin at all periods of development, may readily be stud- 
ras This microscopic evidence has always been confirmed 
chemically, by making a 
: C. R., ii 673. 
_tTo show to the eye the distribution of the glycogenic matter, Bernard places 
iting tite foetus in an acidulated a'coholic soluti f iodi The horny Petager 
°s, the cutaneous orifices—as the anus and the nasal openings—the eyelid: e 
a and the cornea are most colored. The glycogenic matter in the placenta may 
: be shown in this way. 
QL Jour. Sci.—Szconp SERIES, Vou. XLVII, No. 140.—Mancz, 1869. 
18 
