Efferent Neurones in the Electric Lobes. a 
Biitschli, Held ('), Van Gehuchten (*), Von Lenhossek (°), 
Ramon y Cajal (*), Marinisco (°), Ewing (°), a.o., hold 
the view of reticular or spongy formation of the ground 
substance, stating that the fibrillar structure described by 
others are not true fibrils but rows of fine granules which 
form the reticular arrangement of the ground substance. 
The writer’s observations on this subject are as follows: 
The ground substance of the spinal ganglion cells of the 
white rat exhibits a reticular structure as shown in Fig. 7. 
The meshes of the reticulum are very small but conspicuous. 
The size and form of the meshes vary. Generally, in the 
clear zone at the periphery of the cell-body, the meshes are 
always larger and more conspicuous than in the remaining 
part. In the neighborhood of the axone hillock the meshes. 
are not only much diminished in size, but also they are much 
elongated along one axis. Around the nucleus, the meshes 
reach a minimum size. The form of the reticulum at the 
periphery shows meshes of a somewhat polygonal shape, but 
in the remaining part of the cell these meshes are elongated, 
especially around the nucleus and near the neuraxone. Upon 
examining with a higher magnification, the protoplasmic 
threads or filaments which forms the reticulum, we see that 
it is not smooth but has a somewhat varicose appearance, due 
to the presence of small bead-like arrangements on the 
course of the filaments. ‘This bead was called by Held (*) 
a “‘neurosome,”’ who discovered the occurrence of the neuro- 
some not only at the connecting point of the net but also 
inside the net. The writer noticed the occurrence of these 
structures not only at the connecting points of the net but 
also in the course of the filament, but could not find them 
inside the reticulum. 
(1) Held.— Beitrige zur Strukturen der Nerven-zellen und ihren Fortsitze.— 
Erste Abhandlung. Arch. fiir Anat. und Entwickelungs. Anat. Abth., ’95. 
(2) Van Gehuchten.— Anatomie du systém nerveux de l’homme.— Lauvain, 1894. 
(3) Von Lenhossek.— Feinere Bau des Nervensystems.—’95. P. 147. 
(4) Cajal. Estructura del protoplasma nerviso.— Revista trimestral micro- 
grafica, Vol. I, fasc. 1, ’96. 
(6) Marinisco.— Pathologie générale de la cellule nerveuse.— La Presse Médi- 
cale, ’97. 
(6) Kwing.—Studies on ganglion cells.— Arch. of Neurol. and Psychopathol., 
Wools T, Noss. 2798: 
(*) Held.— Loc. cit. 
