Mason — Electrolytes in the Leaf-sap of Sy ring a vulgaris. 659 



Table VI. 



It will be seen that the loss in viscosity after the precipitation of the 

 albumen by boiling is quite small. The decrease shown after three days is, 

 doubtless, mainly associated with the clumping of the colloids, and to some 

 extent, perhaps, to a destruction of the sugars. 



In Table VII the magnitude of the error is shown, which may be intro- 

 duced by the application of the linear viscosity-conductivity correction into 

 the determination of the electrolyte content of the sap. 



The following nomenclature has been adopted : — 



N' 



V, = the viscosity of the sap after filtration. 



Vs+kci= the viscosity of the filtered sap in which potassium chloride ( — 



is dissolved. 

 C s = the conductivity of the sap after nitration. 



ft + kci = the conductivity of the filtered sap in which the potassium chloride 

 is dissolved. 



= the conductivity of the potassium chloride ( — ) dissolved in the sap. 



N 



C* 



ft 



[The conductivity of an ^ KCl solution in water = 0-00715.] 



= the conductivity of the sap calculated from the loss observed in the 

 conductivity of the potassium chloride dissolved in the sap : thus 

 C e is closely proportional to the true electrolyte content of the sap. 



= the conductivity of the sap obtained by the application of the linear 

 viscosity correction. 



The sap for the experiment was obtained from Island Bridge. 



Table VII. 



