1333 



Body weight 



Nerve cell-body 

 Mean diameter 



Nerve fiber 

 Mean diameter I Nerve fiber 

 my: with me- | length 



All the valiies refer to the adult state ; the dimensions in the second 

 column to the largest nerve cells from the columna anterior of the 

 intnmescentia cervicalis, except those in the lijies 5a and Qa, 

 which denote the cross-diameters of Purkinje cells; in the lines 7a 

 and 8 : the mean maximum diameters of the cortical giant pyramid 

 cells of Betz, and the lines 9 and 10, which refer to cells of the 

 ganglia spinalia IV and V. All the nerve fibers are in direct or 

 indirect connection with the intnmescentia cervicalis. M 



Albino Rat. Jom-nal of Comparative Neurology. Vol. 21 (1911), p. 469; (0): Ober- 

 STEiNER, Die Kleinhirnrinde, 1. c. p. 153; (Br): K. Brodmann, Vergleichende 

 Lokalisationslehre der Grosshirnrinde in ihren Prinzipien dargesteilt auf Grund des 

 Zellenbaues. Leipzig 1909, p. 83 and VV. Bevan Lewis, Researches on the Comparative 

 Structure of the Cortex Cerebri. Philos. Transact. Roy. Soc. London, Vol. 171 

 (1880), Part. 1, p. 58; (D) : DuBoia (1. c. and later determinations). 



^) For Mus norvegicus albinus (still called then Mus rattus albushy li^^^DK^^:Y 

 and by Donaldson and Hoke) the mean body weight of tlie adult specimen was 

 put at 250 grammes according to several records, for Lepus cuniculus domesticus 

 at 2000 grammes. 



In the cited paper by Hardesty an error has crept into the calculation of 

 the volume of the cell-body of the mouse. This amounts to 10771, instead of 7974 

 cub. micra. The elephant has only a little more than 29 times the volume óf the 

 cell-body of the mouse, and man O'/j times this volume, instead of 39 and 13 times. 



