1898-99.| STRUCTURE, MICRO-CHEMISTRY AND DEVELOPMENT OF NERVE CELLS. 425 
From Reptilia: in the ganglia of Testudo, Emys, Uromastix, and 
Agama” 
From Anura: in Rana," ~® and Bufo.” 
From Pisces: in the electric lobe of Torpedo,” in Gadus,” in 
Leuctscus,” in Cyprinus,” in Alopias.® 
From Invertebrates: in the crayfish,“ earthworm,” molluscs® ” and 
insects.” 
With the exception of Szczawinska, who states that granules are not 
present in a few cells of some rays, all these observers find a substance 
analogous to that of the Nissl granules present in the nerve cells of the 
different animals examined. I think the reticulum, in the cells without 
granules which Szczawinska figures, is made up of this chromatic 
material, for one frequently finds the chromatic substance in such a 
reticulum in some of the nerve cells of the earthworm, ZLzmax and 
Limnea, while neighbouring cells have the chromatic substance in a 
granular form. In any case the observations on the occurrence of this 
substance in the nerve cells of the pigeon, frog, earthworm, crayfish and 
various molluscs were confirmed. 3 
The nerve cells of other forms which have not been studied, so far as 
I know, by others, were examined,and this chromatic material was found 
in the following forms: 
From Reptilia: cells of cord and cortex of Chrysemys picta. 
From Ganoidei: cells of cord of Amza calva. 
64 Pugnat, Charles Amedee, ‘‘ Recherches sur la structure des cellules des ganglions spinaux de 
quelques reptiles,” Anat. Anz., XIV, p. 89, 1808. 
65 v. Lenhossek, M., ‘‘Centrom und Sphare.inden Spinalganglienzellen des Frosches,” Arch. f. Mik. 
Anat., XLVI, p. 345, 1895. 
66 Dehler, Adolf., *‘ Beitrag. zur Kenntniss von feineren Bau der sympathetischen Ganglienzellen des 
Frosches,” Arch. f. Mik. Anat.. XLVI, p. 724, 1895. 
67 Biihler, l.c. 
68 Rohde, l.c. 
69 v. Lenhossek, M., ‘‘ Der feinere Bau, etc.,” p. 159, 1895. 
7o Flemming, l.c. 
71 Bihler, l.c. 
72 Szezawinska, l.c. 
73 Paladino, G., ‘‘Sur la constitution morphologique du protoplasma des cellules nerveuses,” Arch. 
It. de Biol., XXIX, p. 60, 1898. 
74 Pfliike, Max, “ Zur Kenntniss des feineren Baues der Nervenzellen bei Wirbellosen,” Zeit, f. Wiss. 
Zool., LX, p. 500, 1895. 
75 Eve, l.c. 
76 McClure, Charles F. W., ‘‘ The Finer Structure of the Nerve Cells of Invertebrates,” Zoologische . 
Jahrbiicher, Abth, fiir Anatomie, XI, p. 13, 1897. 
