Cap. VII. PHOSPHATE OF AMMONIA. 161 
Four leaves were immersed as before, each in thirty minima 
of a solution of one part to 328,125 of water (1 gr. to 750 oz.). 
Each leaf thus received ~45, of a grain (0054 mg.) of the salt; 
and all four were greatly inflected. 
(1) After 1 hr. all the outer tentacles but one inflected, and 
the blade greatly so; after 7 hrs. began to re-expand. 
(2) After 1 hr. all the outer tentacles but eight inflected ; 
after 12 hrs. all re-expanded. 
(8) After 1 hr. much inflection; after 2 hrs. 30 m. all the ten- 
tacles but thirty-six inflected; after 6 hrs. all but twenty-two 
inflected ; after 12 hrs, partly re-expanded. 
(4) After 1 hr. all the tentacles but thirty-two inflected; after 
2 hrs. 30 m. all but twenty-one inflected; after 6 hrs. almost 
re-expanded. 
Of the four corresponding leaves in water :— 
(1) After 1 hr. forty-five tentacles inflected; but after 7 hrs. 
so many had re-expanded that only ten remained much inflected. 
(2) After 1 hr. seven tentacles inflected; these were almost 
re-expanded in 6 hrs. 
(8) and (4) Not affected, except that, as usual, after 11 hrs. 
the short tentacles on the borders of the disc formed a ring. 
There can, therefore, be no doubt about the efficiency of the 
above solution ; and it follows as before that each gland of No. 1 
could have absorbed only ggydoaq Of a grain (0000268 mg.) 
and of No. 2 only gasdoao Of a grain (0000263 mg.) of the 
phosphate. 
Seven leaves were immersed, each in thirty minims of a 
solution of one part to 487,500 of water (1 gr. to 1U00 oz.). 
Each leaf thus 1eceived +g355 of a grain (00405 mg.). The day 
was warm, and the leaves were very fine, so that all circum- 
stances were favourable. 
(1) After 30 m. all the outer tentacles except five inflected, 
and most of them closely; after 1 hr. blade slightly inflected ; 
after 9 hrs. 30 m. began to re-expand. 
(2) After 83 m. all the outer tentacles but twenty-five in- 
flected, and blade slightly so; after 1 hr. 80 m. blade strongly 
inflected and remained so for 24 hrs.; but some of the tentacles 
had then re-expanded. 
(8) After 1 hr. all but twelve tentacles inflected ; after 2 hrs, 
30 m. all but nine inflected; and of the inflected tentacles all 
excepting four closely; blade slightly inflected. After & hrs, 
blade quite doubled up, and now all the tentacles excepting 
