Franklin P. Mall - 269 
of a series of superposed hexagons of the same size, the new series of 
circles will not form an equal layer, but will overlap each other. Thus, 
in his Fig. 227, there are six hepatic veins surrounding one portal, while 
in the next figure the opposite is the case. He should have had them of 
equal number, having an alternating space common to both systems, the 
nodal point, as I call it. However, the work of Sabourin is excellent and 
deserves much more attention than it has received outside of France. 
¢ 
Be 
ES 
. 
mk 
Pe 3 
t = “ 
= 
= 
Ss 
= 
Pen NNT 
Fic. 32. From a corrosion in celloidin of the terminal branches of the portal 
and hepatic veins. xX 20. The hepatic vein is larger and marked by many 
constrictions forming a ‘sspiral valve.’ J, interlobular veins; c, central 
vein; s, sublobular vein. 
The typical liver lobule, as described by Kiernan,” is based upon the 
study of the pig’s liver, and is composed of either a single lobule, or of 
clusters of them. It is not clear which he considers the real unit, for 
there are all gradations between single lobules and compound lobules 
composed of at least 25 single ones. As the veins grow larger capillaries 
cease to arise from them, and the opened yein shows at the point of tran- 
sition the bases of adjoining lobules shining through its wall; at this 
» Kiernan, Phil. Trans., 1833. 
