[Vol. 2 



562 



ANNALS OF THE MISSOURI BOTANICAL GARDEN 



placed in distilled water gave practically no greater exosmosis 

 than the control. With stronger concentrations a marked ef- 

 fect would undoubtedly be produced. The results obtained 

 are given in table xv. Another point worthy of note in this 



TABLE XIV 



EFFECTS OF COPPER SULPHATE AND CHLORAL HYDRATE USED SINGLY AND 



COMBINED UPON THE EXOSMOSIS FROM THE ROOTS OF PLANTS 



Cult. 



no. 



Treatment 



1 



2 



3 



4 

 5 



6 



7 



8 



M/10,000 CuSO<, 

 28 hrs 



M/100 CuSO<, 

 27 hrs 



M/8,000 chloral 

 hydrate, re- 

 maining to end 

 of exp 



M/100 chloral hy- 

 drate, 26 hrs. . . 



M/10,000 CuSOi 

 and M/8,000 



chloral hydrate, 

 26 hrs 



M/100 CuSCX and 

 M/100 chloral 

 hydrate, 26 hrs . 



Control (dist. H 2 0, 

 changed every 4 

 days) 



Control (dist. H2O, 



not changed) 



Specific 

 conductivity of 



the sol'ns. * 



2 d 



p o 



c 

 CQ.5 



2.92 



2.c 



o 





16.68 



Values of x, t or bridge readings 

 of the Distilled Water 



tn 



»- 



o 





4) cl 



142.40 151.10 



.35 



.37 



2.82 



1.16 

 3.04 



13.76 

 8.70 



.81 

 2.67 



19.77 16.95 



82.69 95.25 



.32 



.79 



12.56 



.47 



< 



19.7 

 22.0 



20. 6t 

 14.8 



15.0 



17.2 



In 





< 



55.4 

 22.4 



13.1 



16.8 



53.3 



15.0 



14.8 



20.2 



tt 

 12.9 



10.7 



o 

 u 



</i 



V 



MjW 



u 

 U 



C 



13.7 





rt 



16.0 



14.62 

 8.8 



9.0 



11.2 



9.0g 

 8.8 



35.7 

 .4 



o 



0) 



in 



W3 



J3 



49.4 

 16.4 



-7.5 



** 



7.1 



2.0 



10.8 



38.3 



47.3 



3.0 



14.2 



-2.1 



tt 

 6.9 



-4.1 



4.7 



* The values given are to be multiplied by 10~ 5 to obtain specific conductivity 

 values. 



t Resistance in box 9,110 ohms. 

 After 26 hours in the solution. 

 The first 26 hours. 

 After 26 hours in distilled HjO. 

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

 proximately 6.0. 



** After 89 hours in the solution. 



tt After 89 hours in the water. 



connection and seen in table xv is the additional verification 

 of the fact that the rinsing method used throughout this in- 

 vestigation was effective and that no electrolytes were carried 



