SMELL, TASTE, AND CHEMICAL SENSE IN VERTEBRATES. 233 



of particular solutions may be the initial step in the stimulation of the real 

 gustatory end-organs. If this view is correct, the most primitive of the chemical 

 sense organs in the vertebrate is the olfactory organ, followed by that of the 

 common chemical sense, from which the final organ in the series, the organ of 

 taste, arose. This last step involves sensory appropriation, a proci - which i> 

 parallelled in the receptor system of the lateral-line organs and the ear, both of 

 which have probably descended from a sensory mechanism morphologically not 

 unlike that now known to occur in the common chemical sense. 



Aronsohn. E 



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