ON SUPRA-REN'AL BODIES IN THE MOUSE. 221 



In passing, it may be remarked tliat in wciodcut 2, a small 

 portion of the rortical substance is projecting far posteriorly and is 

 separated from the main mass h\ the sympathetic g'angli(Mi. In 

 fig. 17, the part (ac. ror.) is distinctly separated from tlie main mass 

 hy strong connective tissne cells. This is the so-called accessory 

 suprarenal body. From the mode of the entrance of the nerve into 

 the organ, as seen in this and other rases, I am inclined to be- 

 lieve that the introduction of the nervous elements into the organ 

 greatly influences the formation of the accessory suprarenal body, 

 though it may not lie the sole canse. 



Uf the adult suprarenal body (PL XXX. hg. 22). I have little to 

 say, as it does not differ much from that of the ono month old monse 

 (hg. "21). One feature interesting from the embryologienl point of 

 view is the occasional ]jresence of the ganglionie remnants. 

 In one specimen (hg. 23), T f>und at the murgin of the medidla on 

 its medial side, a mass (sv. g.) of indistinct cells, highly granular and 

 deejdv stained. Their nuclei are smaller than those of the mc(bdla 

 or cortex cells but decidedly larger ihan those of the connective tissue 

 cells. P)V tracing sections, [ fonnd the mass t(^ project pyramidally 

 into the cortex and finally reach the capsule. In comparis(^n with 

 the ten-days old suprarenal l)ody (tig. 2»») this mass may be considered 

 as a part of the nei-vons elements, wliich has not been transformed into 

 the true medulla. Of the laro-e ganulion cells such as seen outside 

 the adult suprarenal body. \ could find none pressent within the 

 adnlt organ. 



I)(Melopment of the HeduUary Substan<'c, in the 

 1 3 t h - 1 8 t h day E m b r v o s . — lîalf )ur ' remarked i n his mono - 

 graph on elasmobranch fishes that the suprarenal bodies of 



1. Olilei* erature I had not access to. 



