( 380 ) 



substance. And the figures obtained with tlio same species of cell 

 by meaus of different salt-solutions agreed well with each other. 



If we calculate this proportion also here (l^t column), considering 

 the Na Cl-solution of 0.9% as the physiological one, we find for 

 the volume of the protoplasmatic substance with respect to that of 

 the whole cell 



from a and d . . . . 57.8% 

 from a and c . . . . 58.2% 

 from b and d . . . . 57.1%. 



These figures correspond well to each other and, joined to other 

 experiments yielding the same results, which wo must omit however 

 to describe here, justify the same conclusion which, at <he time, we 

 ai'rivcd at with respect to blood -corpuscles and spermatozoa. 



But not only is there considerable agreement among the figures 

 obtained for the volume of protoplasmatic substance of the bladder 

 epithelium of different pigs and horses, but it struck us that these 

 figures deviated so little from those, which we had found with the 

 red and the white corpuscles of the latter animal (Proceedings Royal 

 Academy Amsterdam, May, 1898). 



Hence the idea occurred to us that we should once more try 

 simultaneously with the same unlnial to determine the volume of 

 protoplasma- substance in bladder-epithelium and blood-corpuscles. 



As will appear from the following experiment, the agreement was 

 striking, indeed. 



Experiment XLI. 



Bladder-epithelium of a pig and defibrinated blood of the same 

 animal are mixed with Na Cl-solutions of 0.7'7o and 1.57o, ""^^^ ^^'^'^ 

 an hour afterwai'ds both pairs are simultaneously centrifugalized. 



Volume of Coutraction by 



sediment I NaCl 1.5°L 



«. KaCl-sol. of 0.7°/o 1 

 i. , » " 1.5°/„ ) 



c. KaClsol. of 0.7°/o 1 



Bladder-epitliclium 



Red corpuscles. 



9G 

 69 



134 



X]00:;z88.1°/o 



134—96 



-^3^X100 = 88.4% 



