126 



DUDLEY MEMORIAL VOLUME 



Table 3. Summary of analytic results in percentages. 

 (Analysis of William H. Walker.)^ 



The following supplemental report was sent later by Prof. Gies (April 

 22, 1907) ; 



Table 4. Results obtained by washing the ashes free from chloride. 



SUMMARY OF TESTS OF ELECTRIC RESISTANCE OF PLANT SOLUTIONS. 



The electric resistances of the plant solutions were determined by the use 

 of the same apparatus as was employed in testing soil solutions. Several 

 methods were used in preparing the material for testings as follows : Air dry 

 leaves and young twigs were boiled in water for five minutes, and the solution 

 expressed by the use of a small press. Fresh leaves and young twigs were 



s The figures in the first of each pair of columns are averages of closely agreeing 

 results in duplicate. The second column of each pair gives the figures for corre- 

 sponding percentage contents in water-free material. 



