512 ; Edwin G. Kirk. 
dinary process of compounding, found in fundus, pylorus and also 
in the cardia. In each type, the epithelium seems to display the 
initial irregularity, but soon mesoblastic growth seems to become 
the active factor. I wish to emphasize the point that there are 
never, at this time, any transitions between the parietals and the 
mucous cells, each of which are, in the cardiac tubules, sharply 
distinguishable by the criteria mentioned above. 
While the lower part of the tubule lined by mucous chief and 
parietals, is being compounded, a very rapid growth of the gland 
processes elongates greatly the wide, upper part lined by goblet 
1.e., the foveola (19-25 em.) Thus at 18 cm. (fig. 16) the foveola 
constitutes only the upper third or fourth. At 22.5 cm. the meas- 
urements are, foveola 48y, tubule 64y, total 1124 or foveolar 
length to tubule length as 3 to 4. At 25 em. the foveolarlengthis 
to the tubular length as 5 to 8, and the total length is 140y, so 
that the tubule portion has scarcely lengthened since22cm. Thus 
the definitive form and proportions are practically reached at 
25 em. (fig 24) and from now on, foveola and tubules grow with 
about equal rapidity. 
As in all earlier stages, there is, at 25 to 29 cm., a gradual 
transition from undoubted cardiac to undoubted Prete tubules, 
the foveolae, in approaching the fundic region, becoming relate 
and absolutely shorter, but the tubules so much longer that the 
whole gland length is greater. 
At 29 em. the cardic tubule measures 160 in length, the un- 
doubted fundic 210, and the pyloric 240. 
In stages 26-29 cm. the parietals are just as numerous and 
just as well defined (figs. 25 and 26) as ever, staining with nor- 
mal brilliancy, and possessing ductules and all the characteristic 
structures. But the cardiac glands of the adult pig contain no 
parietals, only mucous chief and thecal cells. Thus the parietals 
must either degenerate, or become transformed into mucous cells, 
during the intervening period. I have been unable to obtain 
stomachs of young pigs. I suspect, from the results of Cade and 
Harvey (’07) that the parietals may transform into mucus cells. 
I have to report on this in a subsequent paper. 
One more point in the cytodifferentiation of the cardia should 
