1902] 



ELECTRICAL CONDUCTIVITY OF PLANT JUICES 



89 





\ 



1 



same conditions of soil and moisture. It was desirable to 



make determinations for plants subjected to other conditions, 



and Niiphar advena was selected as a good example of a hydro- 

 phyte. 



Conductivity measurements and ash determinations were 

 made for the juice obtained from the blades of the leaves, 



the petioles, the rhizome, and the roots. 



All parts of the 



j)lant used^ were very carefully washed, and all moisture 



removed from the surface with filter paper before the juice 



was extracted. The results obtained are shown In the follow- 

 ing table : 





Sp. cond, of 

 juice 



Crude ash from 



5CC 



1 



Sp. cond, ash 

 sol. 



Blades of leaves . . . 



0.009368 



0.0328 



0.00784 



Petioles .... 



0.009368 



0.0327 



00S22 





\J f l^> \^ V^ ^v ^ri 



Rhizome 



0.00761 



0.0298 



00822 





V/ * V' ^^ ^-^ ^' " 



Roots 



O.006113 



0.0226 



0.00568 



1 





I 



The above measurements show that there is a progressive 

 mcrease in the conductivity of the juice from the roots through 

 the rhizome to the leaves, the measurements for petioles 

 and blades of leaves yielding the same results. The crude ash 

 determinations show a like progressive increase from the roots 

 upwards. The crude ash was redissolved in distilled water and 

 diluted up to the original volume of the juice, and the specific 

 conductivity of the ash solutions determined. The result 

 obtamed for the rhizome ash deviates from what might reason- 

 ably be expected, being slightly in excess of that obtained for 

 he juice. The others show a slightly lower conductivity than 

 the original juice, showing that part of the conductivity was due 

 to other than ash constituents. 



A comparison may be made of the specific conductivities in 

 this species and some nf thf» r,r^v-;nii« ^vamnles_ In Beta vnl- 



some of the previous examples. 

 sans the specific conductivity of the juice from the leaves 



IS 



! 



r - 



