232 C. JUDSON HERRICK 
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Figs. 19 to 21. Three horizontal sections through the brain of Acris gryllus. 
Golgi method.  X 35. Figure 19 is from a specimen in which the ventrolateral 
olfactory tract is impregnated for its entire length, and figures 20 and 21 are 
from another specimen cut in the same plane, in which the olfactory projection 
tract is impregnated, in both cases on the right side only. The cell bodies of 
but few neurons are impregnated in these preparations. Those which are 
unimpregnated, however, are clearly visible and their arrangement is indicated 
somewhat conventionally by stipple. 
