THE NITROGENOUS EXCRETION. URINE. 



377 



given some pages back. The figures here given show the 



results : 



But if an attempt were made to calculate the urine conduc- 

 tivity by adding together the individual conductivities of the 

 various salts for the concentrations as found by analysis the 

 result would be too high, as the conductivity of each substance 

 is lowered somewhat by the presence of the others. It is pos- 



