502 Edwin .G. Kirk. 
tion of the left region, rather than on any true, differential diver- 
gence. Nor, indeed, shall we expect to find, at any time, a sharp 
boundary comparable to that between the fundus and pylorus— 
for such does not exist in the adult pig. (Vide Greenwood ’85; 
Bensley ’02, p. 128) . Hence, the somewhat arbitrary nature of 
the separation for descriptive purposes, of these two regions, 
should be constantly borne in mind. 
After 7 cm., the parietals are no longer confined to the deepest 
part of the fundic tubule, but invade all but the upper quarter. 
Some groups contain 10-12 cells. Especially characteristic from 
this time on is what we may call the “lateral parietal row.’’ This 
is a row of parietals, one or two abreast, extending, often, from a 
point # up the tubule, either to the very bottom, or only part 
way down (fig. 15). The occurrence as a row is, of course, deter- 
mined only by reconstruction and by cross sections, and has been 
often verified thus. In cross section such a tubule will show one 
or two parietals, all the others being adelomorphs. These lateral 
rows occur even in the last stages before birth. However, the 
haphazard distribution of parietals ordinarily described is also 
found, isolated parietals, or groups of 2-3, or even 10-12, occurring 
from now on, not only in rows, but also in superficies. Fig. 13 
represents serial sections through a gland-tubule of 10 cm., and 
illustrates the partial differentiation of the fundic elements into 
parietals, staining a brilliant red in fuchsin §. 
The ductules in relation to the parietal cells are present at all 
subsequent stages, and hereafter, in this paper, their presence will 
be taken for granted. Often a ductule ramifies, sending branches 
between three or four parietals, or two branches between the same 
two parietals. These intercellular ductules are limited by cement 
lines, as shown beautifully by neutral gentian. Most of the parie- 
tals, at 8 cm. and later, display clear vacuoles, sometimes as 
clear areas surrounding the nucleus, but oftenlyingin the periph- 
eral cytoplasm. Harvey (’07) Hamburger and others describe 
these in the adult parietal (vde figs. 18, 20). In general, they 
become more constant, numerous and large inthelaterstages. Of 
course the obvious inference is that they represent droplets of 
secretion to be poured into the intercellular ductules. [havenever 
