THE MORPHOLOGICAL IMPORTANCE OF THE 



MEMBRANOUS OR OTHER THIN PORTIONS 



OF THE PARIETIES OF THE 



ENCEPHALIC CAVITIES. (•) 



Burt G. Wilder, M.D. 

 Professor in Cornell University. 



In the Joi'RNAL OF Comparative Neurology for June, 

 1S91, p. i=;3, the editor. Prof. Herrick, in reviewing previous 

 publications upon the brains of the ganoids and other fishes, 

 ascribes my failure, in 1875, to recognize a certain homology 

 to my not taking into account the existence of certain thin 

 portions which are commonly removed in preparing the 

 brain. 



Upon the present occasion I ofier no opinion upon the 

 particular homologies in question; these and many others in 

 the diversified brains of the fish-like vertebrates, I hope to 

 reconsider hereafter. My object now is to acknowledge the 

 justice of Prof. Herrick's criticism, and to add that for 

 several years it has been my intention to publish a far more 

 vigorous denunciation of the errors as to method and in- 

 terpretation of which I was guilty fifteen years ago. 



This would have been in accordance with the sentiment, 

 long entertained but hitherto unexpressed, that, since every 

 one makes mistakes, the interests of all concerned would be 

 best subserved by the adoption of the custom of each correct- 



I Read at the meeting of the Association of American Anatomists, September, 24 

 1891. 



