﻿266 



54 



tion (jT the nitrogenous compounds; this condensation has a duration of at least 

 5 days. 



This condensation is retarded by narcosis, produced by doses of 02 to OBc. c. 

 ether per liter air-space; furthermore the condensation is retarded at least for 2 

 days after the etherization, if the potatoes have been exposed to ether for 3 days. 



The smallest of the doses used in these experiments has had no toxic in- 

 fluence on the potato-tubers and has not prevented the formation of wounding- 

 cork. On the contrary, the largest dose has prevented the formation of wounding- 

 cork ' during the narcosis ; yet the formation of cork has taken place after the 

 potatoes have been withdrawn from the influence of ether. The largest dose has 

 had a toxic effect as it destroyed the outer layers of cells. 



CHAPTER VII. 



Experiments on the Effect of Etherization on Ripening Seeds. 



A. Pisum. 7 "common-legume" portions, each containing 50 seeds, were 

 used; the seeds, which were young, were picked out of the pods Aug. 14th (1907). 

 The fust portion was crushed directly after the picking, while the other portions 

 remained for 2 days with or without ether in darkness, before they were crushed. 

 Temp. 16°. The following results were found by the analyses: 



Total 

 amount 

 of ether 



Weight 

 of seeds 



N in the 

 filtrate 



from the 

 tannic acid 

 precipitate 



1. Directly crushed 



2. 2 days without etlier 



3. 2 - witli 012,'> c. c. ether 1-75 c. c. 



4. 2 ~ — Ü-38 — — 5-32 — 



5. 2 - - 0-75 ^ — ,! 10-50 - 



6. 2 — - 0-88 - — 12-32 — 



7. 2 - - 113 - - il 15-82 - 



22-48 grs. 



23-59 - 



23-14 — 



23-32 - 



22-83 - 

 23-17 - 



24-02 - 



17-09 mgrs. I 100-00 »lo 



11-38 

 16-97 

 19-91 

 20-13 

 20-77 

 21-64 



fresh, dry. 



66-61 - 



99-a3 ■ 

 116-53 - 

 117-83 - ] - 

 121-54 — j very wet. 

 126-63- - - 



' It must be mentioned here that experiments on the effect of etiler on tiie formation of wounding- 

 corlt were previously made by L. Olufsen, who arrived at the same results as I have. |L. Olufsen, p. 41]. 



