<686 



THE LIVEB. 



meeting the wall of the capillary with the reticulum of living matter in the 

 epithelia. This rim of cement-substance proves to be the place where the 

 finest fibrillae of nerves course. In specimens treated with chloride of gold 

 and formic acid, all structures, except the nerves, were more or less muti- 

 lated and rendered indistinct ; but, in specimens previously hardened with 

 chromic acid, washed with distilled water, and stained with a half per cent, 

 solution of chloride of gold, the relation between epithelia and capillaries is 

 very plain. The details can be seen only with high power (1000 to 1200 

 immersion) and excellent lenses. The beaded nerve-fibrillse are connected 

 by means of delicate threads with the wall of the capillary blood-vessels, as 

 well as the threads in the cement-substance between epithelia. Sometimes 

 the nerve-filament is so closely attached to the wall of the epithelium, or to 

 the capillary, or to both of them, that the light intervening rim and the 



FIG. 304. DIAGRAM OF THE TERMINAL NERVE-PLEXUS 

 OF THE LIVER. 



P, portal vein ; D, bile-duct ; L, capillary vessels in a longitudinal, T, in transverse sec- 

 tion ; E, liver epithelia ; B, bundle of non-medullated nerve-libers ; A, axis-fibrillae, penetrating 

 the lobule; N, axis-librillae in the cement-substance between epithelia. 



interconnecting filaments cannot be seen. In other cases, the relations are 

 plainly marked. (See Fig. 304.) 



In the cement-substance between the epithelia I have seen delicate fila- 

 ments around the capillary blood-vessels, which from analogy I think I am 

 justified in taking for nerves. These were visible with high powers in speci- 

 mens stained with carmine, but more plainly in specimens stained with 



