328 Journal of Comparative Neurology. 



to describe and interpret the conditions encountered in a given 

 brain. 



§249. I freely admit my ignorance or non-comprehension 

 of certain points, and also that my views have varied somewhat, 

 particularly as to the segmental value of the olfactory region of 

 the brain. Nevertheless, I regard myself as justified in advo- 

 cating the schema presented in Table VII upon the following 

 grounds: — (i) For more than twenty years the general question 

 has never been long out of my mind ; (2) with special reference 

 to it I have prepared and studied scores of brains of all classes 

 and most of the orders ; (3) the subject has been discussed more 

 or less fully in papers by me^ upon the brains of many different 

 forms ; (4) papers upon other forms^ have been prepared at this 

 institution ; (5) the schema has proved practically available for 

 research as indicated above, and has been readily comprehended 

 and remembered by even general students. 



§250. What I advocate is that there be recognized for 

 the present six definitive segments of the vertebrate brain under 

 the titles Rhinencephalon, Prosencephalon, Diencephalon, Mes- 

 encephalon, Epencephalon^ and Metencephalon. It is my in- 

 tention to review the whole subject at the coming meeting of 

 the Association of American Anatomists in May, 1897. 



Pa7't VIII. Concbiding Remarks. 



§251. A. Practical Suggestio7is. — As one of the older 

 American anatomists, and as having committed at least my 

 full share of terminologic errors, I venture to formulate some 

 suggestions of a practical nature for the benefit of the younger 

 generation. 



^See Bibliography, '7=;, c; '76, a, b, c; '77, a; '81, d; '84, a,d; '85, b; 

 '87, a, b, c ; '89, a ; '9I, b ; '93, a; '96, d; W. & G., '82, chap. X. 



'■^See papers by Clark, Mrs. Gage, Fish, Humphrey, Kingsbury and Stroud. 



^Even if Osborn is correct in his interpretation of the cerebellum as 

 " primitively " intersegmental ('88, 57) he nevertheless admits that it " second- 

 arily acquires a functional importance equal to that of the other segments." 



