[Vol. 2 



558 



GARDEN 



determine this point. Solutions of pure saccharose of vary- 

 ing concentrations were used and the effects produced by the 

 same during a period of 24 hours as compared with pure dis- 

 tilled water, measured by the determined conductivity of the 

 medium both during the 24 hours and after (when the plants 

 which had been in the sugar solutions were also placed in dis- 



tilled 



These 



As 



seen, no differences were obtained from the different 



trations 



EXOSMOSIS FROM THE 



TABLE X 



ROOTS OF PLANTS IN SUGAR 

 DISTILLED WATER * 



SOLUTIONS AND 



Time of readings 



Culture 1 



1.28% sac- 



charose sol'n. 



24 hours 

 followed by 



dist. H*0 



Culture 2 

 2.56% sac- 

 charose sol'n. 



24 hours 

 followed by 



dist. H 2 



Culture 3 

 5.13% sac- 

 charose sol'n. 



24 hours 

 followed by 



dist. H 2 



Culture 4 



control 



dist. 



H 2 throughout 



changed 



every day 



conductivity 



readings 



Conductivity readings of the sugar solutions: 



Before roots placed in 

 the solution 



After 10 hrs 



After 24 hrs . , # 



Increase over original 

 Bol'n. during 24 hrs . . . 



10.9 

 32.9 

 32.9 



22.0 



Conductivity readings of the distilled water: 



After i hr 



After 23 hrs 



After 48 hrs . . ; 



Increase over dist. H 2 



the first half hour t. . 

 Increase over dist. H 2 



during 48 hours t . . . 



* All readings represent values of x on the Wheatstone bridge, the resistance 

 in the box being 9,110 ohms. 



t The average reading of the distilled water before placing roots in it was ap- 

 proximately 6.0. 



In table xi are shown the effects produced by salts alone 

 as well as by salts plus anesthetics in weak concentrations. It 

 was desired to use approximately the same concentrations of 

 anesthetics as indicated by the work of Lillie ( J 12), Oster- 

 hout ('13), and others. The conductivity of the water con- 

 taining the anesthetics was not determined after the 53-hour 

 treatment and hence the resulting exosmosis during that in- 

 terval was not ascertained. But from other experiments on 



