160 Mr. E. H. Acton. The Assimilation of Carbon 



The plants were not apparently injured by this solution; on planting 

 out they all resumed growth ; the plants of Campanula had formed 

 starch again after ten days (not tested earlier) after planting out. 



0. Solution applied to Surface of Leaf. 



Solution used. 



Plants. 



Results. 



Same solution as 

 above 



Acer pseudoplatanus 

 Tilia Europaa 



]STo formation of starch. 



No. 1. — Experiments ivith Acrolein (continued). 

 IT. Acrolein compounds — 



(b.) lSraHS0 3 compound of Acrolein. 

 A. On Cut Branches. 



Solution used. 



Plants. 



Results. 



The culture solution 

 + about 2 per cent, 

 of tbe crystal. 

 NaHS0 3 comp. 



Same solution as 

 above 



Phaseolus vulgaris 

 Ranunculus acris 

 Tilia Europcea- 



B. Solution supplied to R 



Phaseolus multifiorus 

 Tilia Europcea (2 plants) 

 Cheiranthus Cheiri (2 plants) 



Became unhealthy on 2nd 

 day and were withered 

 at end of 4 days. No 

 starch. 



oots. 



All killed at end of 5 

 days ; showed marked 

 injury after 48 hours. 

 No starch. 



No. 1. — Experiments with Acrolein (continued). 

 Experiments with Water Plants. 

 Method and apparatus as described on pp. 155 — 156. 



Solution used. 



Plants. 



Eesults. 



The culture solution 

 diluted with an 

 equal vol. of dis- 

 tilled water + 0-25 

 per cent, acrolein 



Three plant 

 Two 



Anacharis alsinastrum 

 Fontinalis antipgretica 

 Chara vulgaris 



s of Anacharis from different sot 

 Chara „ 



No starch formed. Chloro- 

 phyll markedly injured 

 after 24 hours. No bub- 

 bles of gas evolved in 

 bright sunlight after the 

 first 24 hours. 



irces were used. 



