Hardesty, Medulla Spmalis of the Elephant. 



167 



ing difterent from that here in mind, his measurements were not 

 confined to any particular cervical segment. Among other 

 points, he was concerned with the relation between the staining 

 properties of the cell body and its size. He describes the 

 larger cell bodies as "Chromophobic" as compared with the 

 smaller or "Chromophilic." We are concerned here only with 

 larger or chromophobic group. Kaisek records only the mean 

 diameters of the largest and smallest (the extremes) of this 

 group rather than averages as here desired. His i-e<;uhs for 

 these may be tabulated as follow:- • 



Since Kaiser gives extremes of a group rather than aver- 

 ages and does not confine his search for such within any given 

 segment, his measurements of the largest cell-bodies can not 

 be compared with those of Table HI. His largest cell for man 

 with a mean diameter of 59 micra compares favorably with the 

 average mean diameter of 58 micra recorded in Table HL His 

 monkey, Cetcocebus sinicus, is a smaller species than Cynoceph- 

 alus babidn (Arabian baboon) and yet the largest cell body 

 found by Kaiser for this specimen is appreciably larger than 

 the average of the ten largest found for the baboon. The bat, 

 Plecotus aiintus is also larger than the small Atalapha cifierea 

 and Kaiser finds that it has larger cell-bodies in its cervical 

 medulla spinalis. Kaiser finds a larger cell body for the white 

 rabbit than any found by the author. This is difficult is to ex- 

 plain. It may be that certain of the cervical segments which 

 Kaiser examined may contain larger cell bodies than the one 

 segment to which the author was confined. It is known that 



