22Ö 



M. IX ABA. 



lyiii«^ close to it. In another mouse at the same stage, a simihir condi- 

 tion Avas observed; the gan<^lion besides Ijeing joined Ijy a nerve com- 

 ing from tlie neighbourhood of the kidney. 



Woodcut 2. 



■i snccessiTL- sections (not cunsccutivu) fiom the posteriui' cud of the left suprarenal, 

 a :3-<lay old mouse. Horizontally sliadrd part— Cortex. Vertically shaded part- 

 Medulla. 



riuided by these facts, I examined again tlie ten-da^^s old mouse, 

 and found in one case the medulla projecting on its medial side and 

 actually t(3U(-hing the connective tissue capsule (PL XXX f. fig. 1^0.) 

 but it Avas not traced to the sympathetic ganglion. These facts 

 plainly show that the medulla is derived from the ganglion colls. 

 When and how the ners'ous elements enter the organ, will be describ- 

 ed below. 



