X Journal of Comparative Neurology. 



what former investigators have found out the total resuhs of this 

 chapter will be given. 



1. Besides the whole surface of the tongue together with its base 

 and the under surface of its tip — the hard and soft palate, without 

 doubt the arcus glosso-palatinus, the tonsils, the uvula, the isthmus 

 faucium, the inside of the epiglottis and the mucous membrane of the 

 cheeks participate in the sensation of taste. 



2. All these parts are sensitive in childhood ; in adults the mu- 

 cous membrane of the cheeks, the middle of the tongue and, with a 

 few exceptions, the hard palate lose their sensitiveness. In some 

 cases the under surface of the tip of the tongue on both side of the 

 frenulum remains receptive also in adults. 



3. The presence of disturbance is accounted for, sometimes by 

 an affection of the cavity of the tympanum, sometimes by individual 

 differences. 



It must be remarked that the perceptive faculty of the inner 

 epiglottis was established by Michelson and Langendorff,^ that of the 

 mucous membrane of the cheeks in childhood by Urbantschitsch.^ 

 Concerning the retrogression of certain taste surfaces in adults I must 

 refer the reader to my longer article in which an explanation accord- 

 ing to the theory of development is offered and literary references 

 given. 



In a furiher investigation I tested the sensitiveness of the different 

 perceptive parts of the cavity of the mouth, by taking as measure the 

 absolute given for the different qualities of taste, obtaining in this way 

 the following general results : 



1. Sensitiveness varies for the different qualities on the different 

 parts of the tongue. Sweet is tasted best on the tip of the tongue, 

 sour on the edge, and bitter at the base, acid equally on the tip and 

 edges, but less at the base. 



2. With regard the the values found in an isolated case for the 

 other taste-surfaces, the sensitiveness for sweet and bitter appears in 

 the following order: Soft palate, arcus glosso-palatin., uvula, under- 

 surface of the tip; for sour, arcus glosso-palat., palat. molle, uvula, 

 under-surface of the tip ; for salt, palatum molle, under-surface of 

 the tip, arcus glosso-pal., uvula. The values are in part considerably 



'Centralblatt fiir Physiol. 1892. P. 204. 



'■'Urbantschitsch, Beobachtungen iiher Anomalien des Geschmacks, etc., in Forge 

 von Erkrankungen der Taukenhohle. 1876. — I desire to draw special attention 

 to this interesting work. 



