li)()4.] 



PUBLIC IKK'rMKXT— No. ;W. 



17 



proxiiiuito ouiTciit strengtli.s can be obtained, as it does not 

 constitute a i)artieularlv favorable tvi)e of instrument ibr 

 obtainino- unifoiin currents of a definite streno'th. Our ex- 

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

 nevertheless, to use it with some degree of certainty of 

 securing optimum strengths of current. The three gravity 

 cells with wire electrodes apparent!}- furnish too mueh cur- 

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

 the o})timum and in the retardation zone (see Fig. 1). This 

 method of applying current was not considered a satisfactory 

 one, and it Avas subsequently abandoned. 



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

 total gain being 13.(50 and 10.98 per cent. respectivel3\ 

 At the bottom of the ta]:>le is given the total gain from elec- 

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

 three treated boxes are compared with the weights of those 

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

 is of little siirnificance. 



Table II. — fihounng the Effect of Current Electricity npon the (frowth 

 of Hffdishes (^lUijthauns safiriis L.). Normal I'laiit^ tdken aft tit e 

 Standard at 100. 



[Duration of experiment, 30 il.aj'S.] 



Total average weight, in grams: — 



Of roots, 



Of tops 



Of whole iilant. 



Per Cent. 

 Normal. Treated, gained. 



5.2!) 7.77 46. S8 



5.55 10. iV.) 1)0.85 



10.84 IS. 36 6iK.'-.4 



