Joseph Marshall Flint al 
brane which is absolutely inseparable by any of the methods at our 
disposal. 
The alveoli of the submaxillary of the adult pig have no elastic tissue 
either around them or in the interalveolar spaces. In studying, there- 
fore, the development of the lobules through a series of embryos by 
means of elastic tissue methods, no reac- 
tion is obtained while the developing re- 
ticulated membranes are easily demon- 
strated by Mallory’s method. Specimens 
of the embryonic glands that have been 
macerated for some time in a saturated 
solution of bicarbonates of soda and sub- 
sequently shaken to loosen and remove 
the cells show the fibrillated membranes 
but none of the homogeneous type. This 
is true of the ducts as well as the alveoli. 
If these preparations are treated with 
0.5% HCl or 0.1¢ KOH the reticulated 
membranes swell and become clear and 
the individual fibrils can usually be seen 
; § Fig. 9. Mucous alveoli of adult 
with the immersion lens. pig’s submaxillary showing retic- 
ulating basement membranes. 
In this description there has been a __ Stained by Mallory’s method after 
Zenker’s fluid. Attention should 
somewhat loose use of the term syncy- be directed to the fact that the 
; seale of this drawing is just one- 
tium, for even where the cells of the em- half that of the balance of the 
2 A . series. Magnified 450 diameters, 
bryonic connective tissue have become 
separated and obtained their individuality, the word has in many cases 
been employed. It is very difficult, however, to draw a clear dividing 
line, because cellular independence is not, as a rule, granted to all of the 
elements in an organ at one time. Strictly speaking, of course, the 
syncytial stage ceases when the cells take up their individual existence, 
but to avoid confusion it is perhaps best to use the same term through- 
out, provided, it is understood that the tissue so designated is under- 
going constant changes. 
