11)04.] 



PITBLTC DOCrMEXT — \o. 33. 



17 



proximate currt'iit strengths can be obtained, as it does not 

 constitute a particularly favorable type of instrument for 

 obtaining uniform currents of a definite strength. Our ex- 

 tensive use of the ai)paratus in other work has enabled us, 

 nevertheless, to use it with some degree of certainty of 

 seeurino- optinuuu streni>ths of current. The three oravity 

 cells with wire electrodes apparentl}- furnish too nuich cur- 

 rent, hence we obtained a loss with these. We were beyond 

 the optimum and in the retardation zone (see Fig. 1 ) . This 

 method of applying current Mas not considered a satisfactory 

 one, and it was subsequently aliandoned. 



Nos. 1 and 3 showed a gain in both roots and tops, the 

 total gain being 13.(50 and 10.98 per cent, respectively. 

 At the bottom of the table is given the total gain from elec- 

 trical treatment ; for example, the weights of the plants from 

 three treated boxes are compared Avith the weights of those 

 in the three normal boxes. The total gain of 4.93 percent, 

 is of little siiiuificance. 



Tablk II. — Shonrinfj the Effect of Current Electricity iqwn the Growth 

 of Btidishcft (]iaj)Ji(i»/ts sutiriis L.). Ncji'mal I'lantfs takoi. as the 

 Stdiidanl at 100. 



[Duration of experiment, 39 days.] 



Total average weight, in grams: — 



Of roots 



Of tops 



Of whole plant. 



Per Cent. 



Normal. Treated, gained. 



5.29 7.77 46.88 



5. .55 10. .5!) 90.85 



10.84 18.36 69. .54 



