CHAP. VII. PHOSPHATE OF AMMONIA. IGo 



the four corresponding ones in water; but after 24 hrs. they 

 were slightly more inflected. Such evidence, however, is not at 

 all trustworthy. 



Twelve leaves were immersed, each in thirty minims of a solu- 

 tion of one part to 1,312,500 of water (1 gr. to 3000 oz.); so that 

 each leaf received 48 ooo of a grain ('00135 mg.). The leaves were 

 not in very good condition ; four of them were too old and of a 

 dark red colour ; four were too pale, yet one of these latter acted 

 well ; the four others, as far as could be told by the eye, seemed 

 in excellent condition. The result was as follows : 



(1) This was a pale leaf ; after 40 m. about thirty -eight ten- 

 tacles inflected ; after 3 hrs. 30 m. the blade and many of the 

 outer tentacles inflected; after 10 hrs. 15 m. all the tentacles 

 but seventeen inflected, and the blade quite doubled up; after 

 24 hrs. all the tentacles but ten more or less inflected. Most 

 of them were closely inflected, but twenty-five were only sub- 

 inflected. 



(2) After 1 hr. 40 m. twenty-five tentacles inflected; after 

 G hrs. all but twenty-one inflected ; after 10 hrs. all but sixteen 

 more or less inflected ; after 24 hrs. re-expanded. 



(3) After 1 hr. 40 m. thirty-five inflected; after 6 hrs. "a 

 large number" (to quote my own memorandum) inflected, 

 but from want of time they were not counted ; after 24 hrs. re- 

 expanded. 



(4) After 1 hr. 40 m. about thirty inflected ; after 6 hrs. " a 

 large number all round the leaf " inflected, but they were not 

 counted ; after 10 hrs. began to re-expand. 



(5) to (12) These were not more inflected than leaves often 

 are in water, having respectively 16, 8, 10, 8, 4, 9, 14, and ten- 

 tacles inflected. Two of these leaves, however, were remarkable 

 from having their blades slightly inflected after 6 hrs. 



With respect to the twelve corresponding leaves in water, (1) 

 had, after 1 hr. 35 m., fifty tentacles inflected, but after 11 hrs. 

 only twenty-two remained so, and these formed a group, with the 

 blade at this point slightly inflected. It appeared as if this leaf 

 had been in some manner accidentally excited, for instance by a 

 particle of animal matter which was dissolved by the water. 

 (2) After 1 hr. 45 m. thirty-two tentacles inflected, but after 

 5 hrs. 30 m. only twenty-five inflected, and these after 10 hrs, 

 all re-expanded; (3) after 1 hr. twenty-five inflected, which 

 after 10 hrs. 20 m. were all re-expanded ; (4) and (5) after 

 1 hr. 35 m. six and seven tentacles inflected, which re-expanded 

 after 11 hrs.; (6), (7) and (8) from one to three inflected, which 



