﻿1903] 



CHEMICAL STIMULATION 



163 



TABLE VI. 



M 



December 17. Test of ZnSO.. 



100 ■* 



Time 



II : 52-1 : 52 



I : 52-2 : 52 



2:52 



2 : S2-3 : 52 



M 



100 



Experiment 



Remarks 



. 0.042 



0.040 



ZnSOj in 

 0.430 



Total COg in first hour 



Total CO3, second hour 

 Total CO3, third hour 



0.320 

 0.750 



0.665 

 0.550 



exp. bottle. 



The "water was poured from both bottles and 

 boiled, and the CO3 collected; the excess 

 from the exp. bottle over that from the con- 

 trol was 



A similar treatment another hour with fresh tap 

 water showed 



After the third hour the plants were put into water, and were alive but unsound 

 the next morning. 



TABLE VII. 



December 18. Test of — ZnS04. 



50 * 



Time 



9:35-11:35 

 11:35-12:35 



12:35- 2:53 

 2:53 



^ 2 : 53- 3 : 53 

 t-xcess from exp 



Total CO„ 



Experiment 



Remarks 



50 



0-033 

 0.030 



0-033 



ZnSO^ in 



0.490 

 0.300 

 0.790 



exp. bottle. 

 The COa was driven off as in the last exp 



The preceding experiments were all performed at I9°-2I° C 



The temperature for the next one was 28 



° --°c. 



29 



Time 



9:36-11 142 

 11-42- 1:42 



I : 42 

 ^ 1:42-2:42 



i^xcess COo from 



M 

 50 



TABLE VIII. 



M 



December i6. Test of — ZnSO. 



50 



2 MUiu exp 

 Total CO„ 



0.045 

 0.045 



ZnSO^ in 



1. 000 

 0. 160 

 1.X60 



Remarks 



r 



exp. bottle. 

 The COo driven from both bottles, 



'Ctt 



