K 
508 Edwin G. Kirk. 
In cross sections of tubules at 19 em. most of the parietals are 
shown to be in line with the other cells (fig. 23) but here and there 
a few are assuming the true parietal position. At all stages of this 
process, the ductules preserve their direct continuity with the 
gland lumen. The parietals here, as in the cardia, are, by the 
24 cm. stage, much larger than the chief cells and of a rounded or 
ovoid form. 
At 19-20 cm., by the progressive upgrowth of the gland proc- 
ess the foveola (part above the region of parietals) has length- 
ened very perceptibly, so that now it constitutes about one-half 
the total tubule length (fig. 19). The deep goblets of the foveola 
(a, fig. 19 are replaced below, in the cervical region, with mucous 
chief cells (b), with which parietals (c) are interspersed. The 
lower third is lined by serous chief cells, adelamorphs and a few 
parietals. The adelomorphs and serous chief cells are not dis- 
_ tinguishable in the three color stain of fig. 19. Both are in fre- 
quent mitoses. 
After 19 em. by elongation of the tubule part (cervix and fun- 
dus segments) the proportions of tubule length and foveolar 
length are rapidly altered so that at 25 cm. the foveola : tubule : 
1: 2. This proportion is preserved up to the time of birth. 
4. Cardia and caecum 
At 7-9 em. the cardiac glands are mostly either in the intra- 
epithelial stage or in stages between those of figs. 3 and 6. Al- 
most all, except the very youngest, have one or two parietals. 
The cardiac glands haye now extended to the summit of the caecal 
swelling, being here of the intra-epithelial type. At 7 cm. all the 
cells are either adelomorphs or parietals. The later are at first, 
as in the fundus, confined to the lower part of the tubule (fig. 11) 
but at 10-11 cm. appear higher up, as in the fundic tubules of 
7-8 cm. Lateral parietal rows soon become very common 
(13 cm.) 
At 11-12 em. and thereafter, differentiation of the surface cells 
into mucous cells occurs. Some acquire a mere distal rim of 
mucus, some a deep goblet. At 13-14 cm. the mucous change 
