Chav. VIL PHOSPHATE OF AMMONIA. 164 
and most of them rather closely, four or five being only sub- 
inflected. 
(3) No change for the first 12 hrs.; but after 24 hrs. all the 
tentacles excepting those of the outermost row were sub-inflected, 
with the blade ifflected. After 36 hrs. blade strongly inflected, 
with all the tentacles, except three, inflected or sub-inflected. 
After 48 hrs. in the same state. : 
(4) to (8) These leaves, after 2 hrs. 30 m., had respectively 
32, 17, 7, 4, and 0 tentacles inflected, most of which, after a few 
hours, re-expanded, with the exception of No. 4, which retained 
its thirty-two tentacles inflected for 48 hrs. 
Now for the eight corresponding leaves in water :— 
(1) After 2 hrs. 40 m. this had twenty of its outer tentacles 
inflected, five of which re-expanded after 6 hrs. 30 m. After 
10 hrs. 15 m. a most unusual circumstance occurred, namely, 
the whole blade became slightly bowed towards the footstalk, 
and so remained for 48 hrs. The exterior tentacles, excepting 
those of the three or four outermost rows, were now also in- 
flected to an unusual degree. 
(2) to (8) These leaves, after 2 hrs. 40 m., had respectively 42, 
12, 9, 8, 2,1, and 0 tentacles inflected, which all re-expanded 
within 24 hrs., and most of them within a much shorter time. 
When the two lots of eight leaves in the solution and in the 
water were compared after the lapse of 24 hrs., they undoubt- 
edly differed much in appearance. The few tentacles on the 
leaves in water which were inflected had after this interval re- 
expanded, with the exception of one leaf; and this presented 
the very unusual case of the blade being somewhat inflected, 
though in a degree hardly approaching that of the two leaves in 
the solution. Of these latter leaves, No. 1 had almost all its 
tentacles, together with its blade, inflected after an immersion 
of 2 hrs. 30 m. Leaves No. 2 and 3 were affected at a much 
slower rate; but after from 24 hrs. to 48 hrs. almost all their 
tentacles were closely inflected, and the blade of one quite 
doubled up. We must therefore admit, incredible as the fact 
may at first appear, that this extremely weak solution acted on 
the more sensitive leaves; each of which received only the 
soeoo Of a grain (00081 mg.) of the phosphate. Now, leat 
No. 8 bore 178 tentacles, and subtracting the three which were 
not inflected, each gland could have absorbed only the ~o¢saa5 
of a grain, or 00000463 mg. Leaf No. 1, which was strongly 
acted on within 2 hrs. 30 m., and had all its outer tentacles, 
except thirteen, inflected within 6 hrs. 30 m., bore 260 tentacles; 
and on the same principle as before, each gland could have 
