I/O Journal of Comparative Neurology. 



more, Johnson regards this communis system as exclusively vis- 

 ceral, i.e. entodermal, and opposes to it the other sensory system, 

 viz. the general cutaneous and acustico-lateral,as related to strictly 

 ectodermal sense-organs. This, however, seems to lead us into 

 serious difficulties, for, in the first-place, the terminal buds of 

 the outer skin, which are very numerous in some fishes and 

 which can hardly be other than ectodermal, are apparently all 

 innervated from communis system. Again, the taste buds of 

 the mouth of fishes all or nearly all lie in the region of the 

 stomodxum and are therefore probably of ectodermal origin. 

 These among other facts seem to forbid the employment, in the 

 present state of our knowledge, of any such morphological cri- 

 teria of the components as Johnston adduces. Indeed, the 

 basis for the seggregation of the components may be funda- 

 mentally physiological, as Cole and Kingsbury seem inclined to 

 believe. 



August 1, IS'JS. 



Rkview of Johnston on the Cranial Nerves of the 

 Sturgeon.^ 



By O. S. Strong, 



Columbia University. 



Tliis communication contains a resume of the results of 

 the author's investigation on the hind brain of Acipoiscr 7'ubi- 

 cundus, Le Seur. The investigations were made by means of 

 the method of Golgi on the brains of fishes 25 to 40 cm. in 

 length. Only a few of the most striking results will be noted 

 here, leaving a more detailed review till the appearance of the 

 final paper. The work is of a character much needed in this 

 field at present and though surprising in some respects, the re- 

 sults will doubtless be very valuable. 



' Hind Brain and Cranial Nerves of Acipensar, by J. R. Johnston (Univer- 

 sity of Michigan). Anatomischer Anzeiger, XIV Hand, Nr. 22 and 23, i8y8. 



