r H. xxxvi.] THE KIDNEY. 53 1 



and are found to be made up of several distinct portions which differ 

 from one another verv markedlv, both in situation and structure. 



Pig. 417. A diagram of the nectiona of uriniferoua tubes. A, cortex limited externally by 

 the capmile ; a, subcapmilar layer not containing Malpighian corpuscles ; a', inner 

 stratum of cortex, also without Malpighian capnules ; B, boundary layer ; C, medullary 

 part next the boundary layer ; i. Bowman's capsule of Malpighian corpuscle ; 2, neck 

 of capsule; -,. first convoluted tubule; 4, spiral tubule; 5, descending limb of 

 Henle's loop; f>. the loop proper ; ;, thick part of tlic amending limb; 8, spiral part 

 of ascending limb ; q, narrow axcending limb in the medullar}' ray; 10, the zigzag 1 

 tubule ; 1 1. the second convoluted tubule ; 12, the junctional tubule ; 13, the collecting 

 tubule of the medullary ray ; 14, the collecting tube of the boundary layer ; 15, duct 

 of Bellini. (Klein.) 



HKl 



