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229 



CHAPTER III. 



Experiments on the Effect of Ether on Seedhngs of Pisum. 



Experiments on the Respiration. 



I. 4 "common-legume" (cfr. p. 13) portions of seeds of sweet-peas having pre- 

 viously been soaked were each put in a sucking flask of 45 liter's capacity for 2 

 days (52 hours) (Jan. 15th— 17lh 1907) Temp. 8—10' C. The amounts of carbon- 

 dioxide produced were estimated. 



1. without ether 



ether per liter 



Absolute Weight of 



amount of seeds in air- 

 ether dried state 



c. c. 



2. 3 c. c. ether per liter 1 35 — 



3. 0-.') c. c. ether per liter 2'25 — 



4. 0'7 c. c. ether per litei- ' 3'1.5 — 



grms 

 3245 

 31-83 

 32-18 

 32 "7 



produced 



mgrms 

 368 

 406 

 415 

 356 



CO 2 per 100 



grnis of the 



objects 



mgrms 

 1134 

 1276 

 1291 

 1103 



»lo 



100 

 112-5 

 113-S 

 97-3 



The results show that the doses, used in 2 and 3, have caused an acceleration 

 of the COo-production, while the dose in 4 has had no effect or it may have pro- 

 duced but a slight retardation of the respiration. 



II. 3 "common-legume" portions were soaked and put aside for 4 days for 

 germination in the respiratory-apparatus (Febr. 11th — 15th). The temp, was 16 — 18" 

 in the day. After the exposition the seeds in 1 had germinated and looked fresh; 

 in 2 and 3 they had not germinated. 



Febr. 



hours 



2fi-40 grms 

 sweet-peas 



26-39 grms 

 sweet-peas 



'Jß'M grms 

 sweet-peas 



ether fl'S c. c. ethe 

 per liter. per liter. 



C02-produced 

 ]ier 100 grms of 



In this experiment the ether has retarded the COo-production, which is retar- 

 ded in proportion to the length of the exposure to ether. The CO^-production has 

 not been accelerated in 2 in the beginning as in the last experiment though the 



I). K. I). Viileiisk. Selsk. SUi-.. 7. Hække, iialuiviilensk. dU matheni. Afil. VI. 6. 30 



