1908.] inthe Placenta and Fatus of the Preqnant Rabbit. 271 * 
than usual. The weight and glycogen percentage of the maternal placentz 
were about normal, but the foetal placente were small; the fcetal livers 
weighed much less than might have been expected, and the glycogen 
percentages of foetal bodies and fcetal livers were both low. The animal 
killed on the 29th day of pregnancy also gave results slightly below the 
normal. 
C. Relationship of Placental to Fatal Liver Glycogen. 
The relationship between the glycogen percentage of the placenta and 
foetal liver is shown in graphic form in fig. 1. For the former, the total 
GLYCOGEN eeacentace MATERNAL PLACENTA ann 
1% FETAL LIVER 
6-5 
b 
a3 
5 
yd 
Oe ual 2. een we 
3.5 ae | 
eee Ne | 
A 
ESE eS a 
° Boe ele ela val 
Cf 
¢ 
& » 
¢ 
Ce 
a 
i8- 19-20-21 - 22-23 -2y-25 - 26 - ay -2e- 2g 
Fig. 1.—The abscissa represents the period of gestation from the 18th day onward. The 
ordinate gives the glycogen percentage. The glycogenic changes in the placenta 
are represented by the black line, those in the fcetal liver by the dotted line. 
placental glycogen was taken, ze. the sum of the amounts found in the 
maternal and fcetal parts of the placenta, and its percentage value was 
calculated from the weight of the maternal placenta. The figure shows how 
closely the decrease of the percentage in the one organ is related to the 
increase of the percentage in the other. This relation is so striking that one 
