SECRETORY APPARATUS OF THE LIVER. 
481 
Explanation of the Plate. 
PLATE XXII. 
Fig. 1. Seven cells forming a linear series. None of them communicate with each 
other ; they contain many oil-globules ; no distinct nuclei. (From the liver 
of Sheep.) 
Fig. 2. Four cells united together by their flattened and apposed margins. 
Fig. 3. Three cells and part of a fourth. The septa between the 2nd and 3rd and 
between the 3rd and 4th have disappeared, and oil-globules are seen in 
transitu. 
Fig. 4. Five cells of a linear series. The last is recently formed, as indicated by its 
smaller size and absence of granular contents ; in front of it is a very large 
and distinct nucleus, round which a cell-wall has begun to form on one side. 
Fig. 5. An interlobular duct partially exposed. Its margins are formed by cells con- 
taining bile, which also extend above it, in the direction of its course. 
Fig. 6. View of a lobule completely surrounded by interlobular ducts. The basement 
membrane existed in each except where the dotted line is drawn. (From 
the Rabbit.) 
a. Intralobular vein. 
b. b.b. Interlobular ducts. 
Fig. 7* Portions of five lobules, showing some interlobular ducts fairly exposed ; the 
course of others is indicated by a dark tract of cells extending over them ; 
in other parts adjacent lobules appear to blend with each other. 
a.a.a. Interlobular ducts laid open by the section. 
b.b.b.b. Interlobular ducts not laid open ; a dark line indicates their course. 
c. c.c. Margins of lobules indistinctly seen. 
d.d.d.d. Intralobular veins cut across. 
e. Branch of a portal vein cut across. 
Fig. 8. The contiguous margins of three lobules, with the intervening ducts and the 
opening of an efferent trunk c. 
a. Basement membrane distinctly seen limiting the dark peripheral 
tract of cells ; secretion not proceeding. 
b. No basement membrane existing ; the extreme cells of the rows form 
the wall of the duct ; the whole side of the lobule is covered with 
oil-globules which appear to be escaping from open cells. 
c. An opening of communication with another duct ; the basement 
membrane is seen lining the floor of the exposed duct, and is 
represented by fine striae. 
d. Sections of intralobular veins. 
The above diagrams have been taken in all essential particulars from actual 
observation. 
3 R 
MDCCCXLVI. 
