] 
No. 4.— CONTRIBUTIONS FROM THE ZOOLOGICAL LABORATORY 
OF THE MUSEUM OF COMPARATIVE ZOOLOGY AT HARVARD 
COLLEGE. E. L. MARK, DIRECTOR. No. 203. 
The peripheral terminations of the eighth cranial nerve in vertebrates, 
especially vn fishes. 
By .R. Ci MULLENIX. 
TABLE OF CONTENTS. 
PAGE 
RIM DELTA eh ve ha syeist  varsvouns ta 8t aE, nevain kel wich ie Adie he, | ple LS 
BEN GTAC AL TEVAG Wes ess yes \ adorvieideceotiereyl so toes ee EMER e See) tre a 
III. Material and methods. .. . ge 2 eh 
IV. General anatomy and histology of ha ear on GI of: ph OL won eee 
RUE AGUS SCINMCCUITCS, = tea sivas Oy bette os, ky ed jae ee 
Pe Ca CListaeracusblcde! ao ecko on ay se ke et ee, ee oO 
ioe a tr ACU AS TCUSTICTe fy Res hee FRE? INE COE © OE ee 
a intmacwianeplectas i)? Li" Paytt ir CLD ORT Le ere e 
VI. Summary of observations . . TB ROR a Ms “he Oe Oe 
VII. General discussion and done ices oS RAP SA he Gea 
VIII. Bibliography. . Sy Stirta Shores iae 4 ae ans) hee 
Explanation of Blaise Laide ta” ek) aeeeumee.C GNE. MaR an tay... ya bie 
I. Introduction. 
Since 1891 much of the investigation and discussion carried on by 
neurologists has been directed to the solution of the question as to the 
morphological units of which the nervous system is composed. The 
conception that the nervous system is made up of cellular elements, 
more or less independent of one another, which was in that year pro- 
posed by Waldeyer (’91) in his formulation of the neurone concept, 
has found wide acceptance, and stimulated investigations which have 
greatly advanced the knowledge of the minute anatomy of the nervous 
system. ‘The theory has not escaped opposition, however, for a num- 
ber of eminent men, among whom are Golgi, Apaéthy (’97), Nissl 
(:03), and Bethe (:04), have vigorously attacked it; and there are not 
a few at present who see in the fibrillar theory a worthy rival of the 
neurone theory, and regard the neurofibril, and not the neurone, as 
affording a fundamental basis for the understanding of the nervous 
system. 
