214 



DROSEKA EOTUNDIFOLIA. 



CUAP. IX. 



and then placed in the phosphate solution : in 2 hrs. 15 m. there 

 was a trace of inflection in one leaf, and in 5 hrs. 30 m. a second 

 was slightly afifected ; the inflection subsequently increased, 

 though slowly. Hence diluted alcohol, which, as we shall see, is 

 hardly at all poisonous, plainly retards the subsequent action of 

 the phosphate. 



It was shown in the last chapter that leaves which did not 

 become inflected by nearly a day's immersion in solutions of 

 various salts and acids behaved very differently from one an- 

 other when subsequently placed in the phosphate solution. I 

 Jiere give a table summing up the results. 



Name of the Salts and 

 Acids in Solution. 



Rubidium chloride 



Potassium carbonate 



Calcium acetate 

 Calcium nitrate . 

 Magnesium acetate. 



Magnesium nitrate . 



Magnesium chloride 



Barium acetate . 

 Barium nitrate . 



Strontium acetate . 



Strontium nitrate . 



Alti minium chloride 



Period of 

 Immersion 



of the 



Leaves in 



Solutions 



of one part 



to 437 of 



■water. 



22 hrs. 



20 m. 



24 hrs. 

 24 hrs. 

 22 hi-s. 



22 hrs. 



22 hrs. 



22 hrs. 

 22 hrs. 



22 hrs. 



22 hrs. 



24 hrs. 



Effects produced on the Leaves by their siibsc- 

 quent Immersion for stated periods in a 

 Solution of one part of phosphate of 

 ammonia to 8750 of water, or 1 gr. to 

 20 oz. 



After 30 m. strong inflection of the 



tentacles. 

 Scarcely any inflection until 5 hrs. 



had elapsed. 

 After 24 hrs. very slisrht inflection. 



Do. do. 



Some slight inflection, which became 



well pronounced in 24 hrs. 

 After 4 hrs. 30 m. a fair amount of 



inflection, which never increased. 

 After a few minutes great inflection ; 



after 4 hrs. all four leaves with almost 



every tentacle closely inflected. 

 After 24 hrs. two leaves out of four 



slightly inflected. 

 After 30 m. one leaf greatly, and two 



others moderately, inflected ; they 



remained thus for 24 hrs. 

 After 25 m. two leaves greatly in- 

 flected; after 8 hrs. a third leaf 



moderately, and the fourth very 



slightly, inflected. All four thus 



remained for 24 hrs. 

 After 8 hrs. three leaves out of five 



moderately inflected ; after 24 hrs. 



all five in this state ; but not one 



closely inflected. 

 Three leaves whiih had either bten 



slii^htly or not at all afleeted by tho 



chloride became after 7 hrs. 30 m. 



rather closely inflected. 



