Franklin P. Mall . 301 
enlarged to the same scale as Figs. 1 and 2, and Fig. 3, which is on a 
larger scale, are not given to show that the lobules hypertrophy when the 
liver regenerates and are therefore found to be about of normal size. It is 
proved by Ponfick’s experiments, it seems to me, that in regeneration of 
Fic. 55. 
Fig. 56. Fig. 57. 
o 
i. 
Fiaes. 55, 56 and 5 Three views of a model of the liver of a human em- 
bryo, 17% mm. long (No. 9). X16. Gb, gall bladder; wv. umbilical veins. 
the liver, the lobules do not enlarge, but sprout and give rise to new 
lobules, as is the case in the growing liver. 
By comparing the livers of three embryos (Figs. 29-31 and 55-60) it 
is seen that only their upper surfaces are regular in form from stage to 
