ADRENALS OF MAMMALIA. 



509 



malia ; and, in the Bimanous order, they repeat, though in a minor 

 degree, the relation of largest relative size to the immature period. 

 They are snbtriangnlar, flattened, with their base excavated 

 and resting, in Man, upon the upper end of the kidney, whence 

 they have been termed e supra-renal capsules : ' in lower Mam- 

 mals they are more commonly mesiad of the upper end of the 

 kidney, and not always in contact therewith : at the base of the 

 part is a fissure giving issue to the large adrenal vein. The sub- 

 stance of the body is distinguished by, usually conspicuous, differ- 

 ences of colour into ' cortical ' and ' medullary ; ' the former, in 

 Man, being yellowish-brown, the latter reddish-brown : the cortical 

 substance is also firmer than the medullary, which receives more 

 blood, and appears soon to dissolve after death, occasioning the 

 cavity there usually found. The proper areolar capsule sends 

 incurved processes, localising the tissue into lobes and lobules : 

 the ultimate texture of the cortical substance being minutely 

 vesicular, the vesicles varying in size, but affecting an arrange 



V ^J d? 



ment in rows. The vesicles are smallest at the limits of the 

 medullary substance, and here inclose spaces in which the usual 

 results of formifaction more especially are met with ; such as fine 

 granules, globules, nuclei, and nuclear structures, affording ample 

 ground for misinterpretation as s transitions to cell-development ' 

 and ( metamorphosis to the cell-form,' &c. 



Ecker has delineated some of the evidences of size-limit- 

 ing, form-giving forces, analogous to those of crystallisation, 

 in fig. 441, where a is a f nucleus,' b 'nucleus enwrapped in 

 a fine granular mass,' c ( cell,' 441 



d ( nuclear vesicle of an em- 

 bryo.' e ( two gland-vesicles 



J O 



with their contents.' With 



these are mixed oil-globules ; 



~ 



in greater abundance in the 

 adrenals of Lissencephala and 

 Carnivora than in those of 

 Man, and more or less ob- 

 scuring the ( nuclei ' and ( gland-vesicles.' These, in the Horse, 

 are smaller and more spherical at the periphery, larger and more 

 oval toward the centre, of the cortical substance, there offering 

 the linear arrangement. Gland-vesicles also occur in the medul- 

 lary substance of the Horse's adrenals. In the Ox the trabecular 

 tissue of the cortical substance defining the lobules is firm and 

 well-marked: the fatty globules are fewer than in Man. The 

 land-vesicles are distinct in the adrenals of the Hedgehog. In 



: -z-r - =^- -- I? = -Vi 



a 



Forms assumed by protoine matters, in solution 

 within the cellular spaces of the adrenal ; Man 

 CCLXXXVII. 



g 



