The development of the kidney in the rahbit. 



295 



size, partly at any rate, from an increase in bulk of the tubules and 

 Malpighian bodies. In the human foetus of eight months the vesicles 

 are seen, but they are by no means so striking a feature of the organ 

 as they are in the rabbit's embryo. Their disappearance is evidently 

 due to their construction, which process goes on until they assume the 

 tubular form, when they remain as part of the tube which joins the 

 straight tubules of the pyramids of Ferrein with the convoluted tubules 

 and malpighian bodies. 



Detailed Account of the Development of a Tubule. 



This may conveniently be studied in a late embryo, for we find 

 the younger tubules forming at the periphery of the organ while 



Pig. 9. 



A stage more advanced than fig. 8. The 

 renal vesicles have divided into tvFO, from 

 one of which the tiibule and Malpighian 

 body is still seen. G position of future 

 glomerulus BC Bowman's capsule. 



Fig. 10. 



A stage more advanced than the last. 



The looped tubule of Henle H is seen; 



the first convoluted tubule / con t and 



the second convoluted tubule // con t 



are also seen. 



