Notes on the Development of the Suprarenal 

 Bodies in the Mouse. 



By 

 Masamaro înaba, Rié^kushi, 



With Plates XXX-XXXI. 



It hns long lieon known that the suprarenal bodies of the ver- 

 tebrata consist of two substances, the medulla and the cortex. As to 

 Innv these two substances arise and in what relations they stand to 

 each other the o])inions of previous investigators are divided. During 

 the academic year, 1888-89, I studied the development of the organ in 

 the common dimiesticated mouse, a variety of ^lus musculus, and 

 came to the conclusion that the cortical cells are derived, as 

 Janosik stated, from the peritoneal epithelium, and the 

 medullary substance arises, as described by Mits uk uri, 

 from the sympathetic elements. The following is a brief 

 account of my investigation. I nmst here express my sincere thanks 

 to Profs. Mitsukuri and Tjima, f)r tlieir constant encouragement 

 and valuable suggestions, without which I could not have finished 

 the work. 



As to the method of investigation I preserved after Selenka the 

 specimens, young and adult, in Kleinenberg's picro-sulphuric acid 

 mixed with chromic acid in the ratio 8 : 1. Some of tlie adult speci- 

 mens were also preserved in bichromate of potash, but as Gottschau 

 justly remarked, it is n<)t necessary to use the chromic acid, at least in 



