— 198 — 
Fig. 19. Patella vulgata. (Magnified 620 diameters; Zeiss F, I. 
Cam. lue. direct upon the stone.) Transverse section of 
a nerve, from which two smaller nerves {a and h) later- 
ally issue. v Ventai side of the nerve, a & h Trans- 
versally transsected nerve-tubes of the small lateral nerves. 
a' & &' Longitudinally transsected nerve-tubes of the same 
nerves, c & d Large nerve-tubes, transversally transsected 
s, s Septa dividing the nerve into bundles of nerve-tubes. 
s\ Septa separating the nerve-tubes of the two small 
lateral nerves from the rest of the large nerve. / Neu- 
roglia-cell with nucleus situated inside the neurilem-sheath 
Jc Neuroglia-nuclei. (From a preparation treated with 
osmic acid (i 7o) foi* 4^ hours, stained with Delafield's 
hæmatoxylin and decoloured in water to wich some drops 
of acetic acid had been added ; the section was tåken directly 
with a razor without imbedding.) 
* 19 A. A part of the section, illustration in fig. 19, highly mag- 
nified to show the structure of the walls between the 
nerve-tubes. 
> 20. Patella vulgata, (Magnified 750 diameters; Zeiss F, 2. 
Cam. lue. direct upon the stone.) Longitudinal section 
of a peripheral nerve near its origin in the pedal nerve- 
cord. gc A ganglion cell sending a protoplasmic process (p) 
towards the neurilem-sheath (sJi); the nervous process 
which runs longitudinally was not distinctly visible in 
this section. k, k\ Jc^^ Circular and oblong, deeply 
staining neuroglia-nuclei. n, nn, nn', nn''\ nrH^^ Ovoid, less 
staining and, generally, larger neuroglia-nuclei. (The pre- 
paration was fixed in chromo-aceto-osmic acid and stained 
with Delafields hæmatoxylin.) 
» 21. Phallusia ohliqua. (Magnified 350 diameters; Zeiss CC, 4. 
Cam. lue. direct upon the stone.) Transverse section of 
a peripheral nerve, sh External neurilem-sheath. (From 
a preparation fixed and hardened in Muller's fluid, stained 
with acid fuchsin dissolved in turpentine with a little 
abs. alcohol added.) 
» 22. Fhallusia obliqua. (Magnified 750 diameters; Zeiss F, 2. 
Cam. lue. ; drawn directly upon the stone.) Longitudinal 
section of a part of a peripheral nerve, a&b Septa 
(longitudinally transsected) between bundles of nerve-tubes. 
n Neuroglia-nucleus situated in one septum (a), ts Sheaths 
