202 BIOLOGICAL PHYSICS 



materials, which are utilised for further purposes, before 

 their final excretion, only a comparatively limited number 

 of these glands primarily discharging their contents, as no 

 longer necessary and altogether effete. 



Adenography is a subject of such large proportions, that 

 nothing less than a treatise would suffice to embrace it. 

 We shall, therefore, content ourselves with a very restricted 



FIG. 68. FIG. 69. 



FIG. 68. FRONT VIEW OF THE RIGHT KIDNEY AND SUPRARENAL BODY 

 OF A FULL-GROWN FCETUS. (Allen Thomson. ) 



This figure shows the tabulated form of the foetal kidney, r ; v, the renal vein and 

 artery ; , the ureter ; s, the suprarenal capsule, the letter is placed near the 

 sulcus in which the large veins (z/) are seen emerging from the interior of the 

 organ. 



FIG. 69. SECTION OF THE SUPRARENAL BODY. (Allen Thomson.) 



A vertical section of the suprarenal body of a fetus, twice the natural size, showing 

 the lower notch by which it rests on the summit of the kidney, and the anterior 

 notch by which the veins issue, together with the distinction between the 

 medullary and cortical substance. 



and general, survey of the subject, so as to afford an out- 

 let for the expression of certain views regarding it, that 

 have presented themselves to us, as we have been study- 

 ing subjects in some way related to it. The principle, or 

 function, of secretion, is entirely monopolised by gland 

 structures, although kindred operations are performed by 

 every cell body, the quasi-homogeneous wall of which is 

 capable of passing through it the material necessary for its 

 growth and maintenance, besides, in the non-processed cell, 

 the kindred and related function of excretion, the only 

 exception to which is said to be the nerve cell, which is 



