﻿1903] 



CHEMICAL STIMULATION 



i6i 



\ 





^ 



TABLE II. 





w ^ 



January 3. 



To test ZnSO. 100 "^"^ baryta water — 12.32'=*= 



acid. 





4000 ^ J 



100 





¥ 



Experiment 



CO.NTKOL 



Time 













Tltre 



cc, N. per hour 



litre 



cc. N, per hour 



10: 16-II : 16 









12.20 



0.012 



II : 16-12 : 16 





12,20 



0.012 



12.20 



0.012 



12: 16- I :52 



M 



12. 15 



i 



O.OII 



12.18 



0.009 



1:52 



100 



ZnSO 4 put 



1 



into 370 '^'^in 



exp. bottle, 



making . 



° 4000 



1:52- 3:04 





1 

 1 



12.05 



0.022 



12.20 



O.OIO 



3:04- 4:04 





12.10 



0.022 



12.20 



0.012 



4:04- 5: 10 





12. 10 



0.C20 



12.20 



O.OII 



5: 10- 7: 10 





II .90 



0.021 



12. 12 



O.OIO 



7 : 10- 9 :3o 





II. 85 



0.020 



12. 10 



0.009 



9:30 10:54(13, 



. 4 hours) 



10.05 



0.017 



10.85 



O.OII 



10:54- 2:36 





II .70 



0.018 



12.00 



0.009 



2:36 



Control 



given same 



dose of 



7nS04. 





2:36- 5:00 





11.80 



0.023 



11.85 



1 



1 0.020 



1 



4 



great variation in the length of the intervals between the tests is 

 a much more severe test of my method and apparatus than 

 making observ^ations regularly, say every hour or two hours, 

 would be. 



The next experiment shows a parallel use of double-distilled 

 and tap water; the evolution of CO3 is hastened slightly more 

 from the latter. 



TABLE IIL 



January 6. To test 



M 



8000 



ZnS04. Double-distilled water in experiment bottle, tap 



water in control. Result in cc. N. per hour. 



Time 



9 



10 



33 

 39 



10:39 



II :5I 



11:51 



11:51 



1:51 



4:51 

 7:45 



M 



8000 



ZnSO^ 



1:51 

 4:51 



7 : 45 

 9:47 



(14 hours) 



Experiment 





Control 



0.015 

 0.022 



in both bot ties- 



0.020 

 0.022 





 

 

 o 



024 

 025 

 025 

 020 







o 





 



034 

 036 



032 



023 



In the next experiment the difference between the tap water 

 and the double-distilled water is doubtful. When it happened I 



^T^. I J m. r ^^^—.W ■ 



