The developruent of tlie kidney hi Mie ral)l)it. 



287 



X in a being that of the end of the tubule, the tubule really extends 

 much further on. The basement membrane, seen at X in h and c is 

 not seen in a, because the plane of section cuts it very obliquely so 



^ 





Fig. 2. 



Drawing of a tubule which in a terminates apparently 

 at a point X. In b the next of the series, and in c the 

 next again the tubule is seen to continue onwards, and 

 a mass of cells in a apparently isolated and to the right 

 in the figure is seen in c to form part of the tubule. 



that it does not appear any longer as a definite line, but is no doubt 

 present as an excessively thin but broad film invisible to the eye. 

 The cells terminating the tubule in a are really transverse and oblique 

 sections of fully formed columnar cells, as is made out in h and c. 



