278 Cc. JUDSON HERRICK 
in the Amphibia, the vomeronasal organ appears to have been 
differentiated in connection with the first of these factors, namely, 
for cooperation with taste and perhaps various tactual and other 
general forms of sensibility within the mouth, in the analysis 
and appropriate disposition of the contents of the oral cavity. 
10. The anuran amygdala was apparently differentiated under 
the influence of the specific sensory excitations coming from the 
vomeronasal organ. So far as the pre-existing nervous pathways 
connected with the ventrolateral area of the cerebral hemisphere 
conducted excitations physiologically congruous with those from 
the vomeronasal organ, these were integrated into a morphologi- 
cal unity as we see it in the amygdala of the frog. 
11. The amygdaloid complex having been thus integrated 
under the dynamic influence of vomeronasal excitations, further 
complication of the system progressed in higher vertebrates in 
various directions by the incorporation of other related sensory 
systems, with perhaps profound modification of the functional 
aspect of the complex asa whole. So great may be this deviation 
from the primitive physiological pattern in some cases that the 
suppression of the vomeronasal organ, as in man, or even of the 
entire olfactory system, as in the dolphin, does not destroy the 
integrity of the surviving components of the amygdaloid com- 
plex, which retains its individuality in modified form. 
