182 RALPH EDWARD SHELDON 
method. In addition to the series noted above, Professor Herrick 
very kindly loaned me ten series of the brains of young carp cut 
in various oblique planes. The Golgi method was used chiefly 
for the study of the different neurones and the course, with par- 
ticular reference to the direction, of the fiber tracts. 
VII. Ramén y Cajal method 
Two series transverse sections. 
Three series frontal sections. 
Five series sagittal sections, two of these partly 
oblique. 
Some difficulty was experienced in getting good preparations, 
the following method giving the best results. Whole brains are 
fixed in 95 per cent ethyl alcohol, washed for two hours in running 
water, placed in a 1 per cent aqueous solution of silver nitrate 
at a temperature of 35° C. for three to five days, washed in dis- 
tilled water, transferred to a 1 per cent aqueous solution of hydro- 
quinone for twenty-four hours, washed inrunning water for twenty- 
four hours, dehydrated, cleared in cedar oil, mounted in paraffine 
and cut at ten to fifteen micra. Fixation in neutral or acid for- 
malin gave poor results. 
II. ANATOMY 
The names applied to the different fiber tracts and cell areas 
have, so far as is consistent with their morphology, been taken 
from the literature. In a few cases such terms have been used 
in a sense slightly different from that assigned them by the orig- 
inal authors; whenever such is the ease the fact has been noted. 
In several cases inappropriate terms of long use have been 
retained owing to their familiarity and common use. Where, 
however, a term is lacking in the literature, or where a previ- 
ously used term is greatly at variance with the morphology, a 
new name has been selected. In this case the endeavor has been, 
as far as possible, to make such new name descriptive of the rela- 
tionships involved, or else suggestive of a homologous structure 
