CH. XXXVI.] 



THE KIDNEY TUBULES 



539 



* 



FIG. 417. From a vertical section through the kidney of a dog the capsule of which is supposed to be 

 on the right, a, the capillaries of the Malpighian corpuscle, which are arranged in lobules ; n, neck 

 of capsule ; c, convoluted tubes cut in various directions ; b, zigzag tubule ; d, t, and/, are straight 

 tubes in a medullary ray ; d, collecting tube ; e, spiral tube ; /, narrow section of ascending limb. 

 x 380. (Klein and Noble Smith.) 



FIG. 418. Transverse section of a renal papilla : a, large tubes or ducts of Bellini ; &, c, and d, smaller 

 tubes of Henle ; e, f, blood capillaries, distinguished by their flatter epithelium. (Cadiat.) 



