8 JOURNAL OF COMPARATIVE NEUROLOGY. 
LuGaro' distinguishes in the dog five different varieties 
of the spinal ganglion cells. 
I. Large clear cells with delicate, closely packed stainable 
masses which are distributed uniformly throughout the cell- 
body. Around the nucleus, the stainable masses are more 
closely packed. The nucleus is large, clear and is provided 
with a nucleolus. These cells appear to be numerous in spinal 
ganglion. 
II. Clear, medium-sized cells with irregularly formed 
small and large stainable masses which are large at periphery. 
Even here we see that individual masses are not isolated but 
are united together by fine processes. The nucleusis clear and 
possesses a nucleolus. These cells are most numerous. 
III. Small, dark cells with small numerous stainable 
masses. Larger masses lying in region of the nucleus. The 
ground substance becomes diffusely stained. The nucleus also 
stains diffusely and contains two or more nucleoli. These cells 
rank third in point of number. 
IV. Small and medium sized clear cells with large stain- 
able masses which are present in small numbers and connected 
with each other by processes. The nucleus freqently possesses 
more than one nucleolus. These cells are not numerous. 
V. Large, clear cells with long drawn out masses which 
are continuous with one another and arrange themselves in con- 
centric lines around the- nucleus. These last cells present a 
laminated appearance like the cross section of an onion. These 
cells are least numerous. 
LrnHOSSEK’ divided the spinal ganglion cells into the fol- 
lowing three varieties : 
The first variety consists of cells with a very pale ground 
substance only. These, which are the largest cells, have a dense 
ground substance and with less numerous and loosely arranged 
stainable masses, which are most dense around the nucleus. 
1 LuGaro, E.—Sulle alterazioni delle nervosi dei ganglia spinali. Rev. di 
pathol. nerv. ¢ ment., Firenze, Vol. V (’96) Nos. 8 and 12. 
* LENHOsSEK—Ueber den Bau der Spinalganglienzellen des Menschen. 
Arch. f. Psychiat. wu, Nervenk., Berl., Bd. XXIX ('96-’97), S. 346-380. 
