SECRETION OF URINE 

 [Fig. 151. 



527 



A section of one of the Pyramids of Malpighi, and of its corresponding cortical substance, as seen under 

 the microscope ; 1, portion of the surface of the kidney ; 2, from this figure up to 1, is the cortical substance of 

 the kidney ; 3, from 2 to this number is the tubular portion ; 4, the foveola; 5, 6, arteries and veins ramifying 

 through the kidney; 7, arteries to the acina of the kidney ; 8, capillary extremities of veins anastomosing 

 with corresponding arterioles; 9, tortuous extremities of the arteries directed into the interior of the gland ; 

 10, bases of the cones of the cortical and pyramidal substance of the kidney; from 10 to 4 is a collection 

 of these cones; 11, the envelop of the cortieal layer; 12, prolongations of the tubular portion; 13. tortuous 

 tubes, or those of Ferrien; 14, straight tubes, or those of Bellini; 15, vessels which wind between them: 

 1C, course of the uriniferous tubes in the tubular portion; 17, the matter between these tubes; 16, bifurcation 

 of <he straight tubes; 19, sections of these tubes; 20, their orifices.] 



sorbents, termed Lymphatic Glands. According to the recent inquiries of Mr. Bowman,* 

 each one of these is included in the extremity of one of the tubuli uriniferi, which swells 

 into a flask-like dilatation to receive it (Fig. 155, c'). The Epithelium which elsewhere 

 lines the tube (whose usual character is shown in Fig. 153) is altered in appearance, where 



* Philosophical Transactions, 1842. 



