88 



BOTANICAL GAZETTE 



[august 



The specific conductivity of the juice from the leaves is 

 shown to be more than twice that of the juice from the bulb, 

 and the amount of crude ash obtained from 5*^^ of the juice follows 

 about the same proportion. The figures for the specific con- 

 ductivity of the solution made up from the crude ash indicate 

 that the ash alone was not the cause of the conductivity of the 

 juice, but that the organic compounds were concerned. Other 

 determinations were made for this species, and all yielded prac- 

 tically the same results. It may also be noticed that the 

 specific conductivity of the juice from the stalk or stem of a 

 specimen in flower is but slightly in excess of that obtained 

 from the bulb. The relative alkalinity of the ash solution of 

 leaves and bulb is as 2.5 : l, which is in agreement with the 

 specific conductivity of the solution. The determinations of 

 the specific conductivity of the juice are thus shown in this 

 species to be a rough measure of the relative amounts of ash 

 present. 



4. Raphanus sativus. 



For the common garden radish only specific conductivity 

 determinations were made, using the juice obtained from leaves 

 and root. The results obtained from two different specimens 

 will show how nearly the specific conductivities correspond. 





I. Specific cond. of 



juice 



IL 



Specific cond. of 

 juice 





0.02105 



0.02055 





Root 



0.020 r I 



0.01833 





The difference here between leaves and roots is less than 

 that obtained for any previous measurements, but the conduc- 

 tivity of the leaf juice is still in excess of that obtained for the 

 root. No ash determinations were made for this species. 



5. Nuphar advena. 



All of the species used up to this point were taken 

 from places where they had been subjected to about the 



