G. Carl Hiiber 



85 



that the parts are clearl}^ recognized — the different portions of a uriu- 

 iferous tubule present certain definite relations which are not materially 

 altered as development proceeds and are maintained in full develop- 

 ment. In the foetal as also in the post-foetal kidney the proximal and 

 distal convoluted portions belonging to a uriniferous tubule form a 

 coil complex which shows certain relations to the Malpighian corpuscles 

 of such a tubule, likewise the beginning and ending of the loop of 

 Henle. The coil complex formed by the proximal and distal convoluted 

 portions of a uriniferous tubule is generally situated just above its 



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Fig. 22. A portion of the cortex and uppermost part of the medulla from 

 one of the series of sections from which the model shown in Fig. 20 was made. 

 X 100. The parts of this tubule represented in this section are sketched 

 darker than the other parts. For fuller description, see text. 



Malpighian corpuscle, forming a more or less compact mass of convolu- 

 tions, the main coils of the proximal convoluted portion Ipng to the 

 inner side — toward the collecting tubule in which the uriniferous tubule 

 terminates — the coils of the distal convoluted portion lying more to the 

 outer side — laterally — although often partly embedded in the coils of 

 the proximal convoluted portion or nearly completely surrounded by 

 them. The proximal convoluted portion leaves the Malpighian cor- 

 puscle on its inner side and passes first upwards — toward the periphery 

 of the kidney, as was also shown by Golgi — then forms coils in various 

 directions, ultimately to return to the neighborhood of tlie Malpighian 

 corpuscle and to pass toward the medulla. The main coils of the distal 

 convoluted portion are usually found a little above the Malpighian cor- 



