2 . The Cincinnati Society of Natural History. 
The spinal ganglion of the white rat was preserved with 
the author’s own mixture (formaline-acetic sublimate mix- 
ture) (*), and for staining, the reagents just mentioned 
were used. 
II. FINER. STRUCTURE OF THE EFFERENT NEURONES 
OF THE ELECTRIC LOBES IN TORPEDO 
OCCIDENTALIS. 
The efferent neurones of the electric lobes of Torpedo 
occidentalis are so large, more than o.r mm. in diameter, that 
they can easily be seen with the naked eye. Under moderate 
magnification, the cell bodies show numerous dendritic pro- 
cesses and the single axone is also visible in most cases. 
The general form of the cell body is somewhat similar to 
that of the motor cells in the ventral horn of the spinal cord 
_ in man and the higher mammals. In most cases, the nucleus 
lies on the side of the cell-body towards the axis- cylinder 
process. The nucleus is nearly spherical, and very large in 
size proportionately to the cell-body (40-30 »). The arrange- 
ment of the chromosomes in the nucleus is somewhat 
. peculiar. They do not show minute spherules suspended in 
the delicate meshwork of the linin substance, but instead of 
that, irregular large masses which fill up meshes of the linin. 
The nucleolus is always visible and lies at one pole of 
the nucleus. Curiously enough, the nucleolus, as a rule, lies 
in the same relative position in all the cells of a given 
section. : 
Under the higher magnification, the internal structure of 
the cell-body shows a fibrillar arrangement of the cytoplasm. 
The nature of this fibrillar structure will be discussed later 
on. In this chapter, only the general arrangements of these 
fibrils will be described. 
Briefly speaking, the cell-body, except the nucleus presents 
everywhere a fibrillar arrangement of the cytoplasm. The 
following descriptions apply to the serial sections of one cell 
(102 » in diameter, and 60 » in thickness), and give a 
general idea of the structure above mentioned. 
*) Hatai, S.— Finer structure of the spinal ganglion cells in the white rat.—_Jour. 
of Comp. Neurology, Vol. XI, No. 1, 1gor. 
