Cnar. V. EFFECTS OF ORGANIC FL IDS. 79 
above-named non-nitrogenous fiuids; and the tentacles 
were not in a single case inflected. 
With respect to nitrogenous fluids, the first which came to 
hand were tried. The experiments were made at the same 
time and in exactly the same manner as the foregomg. 
As it was immediately evident that these fluids produced a 
great effect, I neglected in most cases to record how soon the 
tentacles became inflected. But this always occurred in less 
than 24 hrs.; whilst the drops of non-nitrogenous fluids which 
produced no effect were observed in every case during a 
considerably longer period. 
Milk—Drops were placed on sixteen leaves, and the tentacles 
of all, as well as the blades of several, soon became greatly 
inflected. The periods were recorded in only three cases, 
namely, with leaves on which unusually small drops had been 
placed. Their tentacles were somewhat inflected in 45 m; 
and after 7 hrs. £5 m. the blades of two were so much curved 
inwards that they formed little cups enclosing the drops. 
These leaves re-expanded on the third day. On another occa- 
sion the blade of a leaf was much inflected in 5 hrs. after a 
drop of milk had been placed on it. 
‘uman Urine.—Drops were placed on twelve leaves, and the 
tentacles of all, with a single exception, became creatly inflected- 
Owing, I presume, to differences in the chemical nature of the 
urine on different occasions, ithe time required for the movements 
of the tentacles varied much, but was always effected in under 
24 hrs. In two instances I recorded that all the exierior ten- 
tacles were completely inflected in 17 brs, but not the blade of 
the leaf. In another case the edges of a leaf, after 25 hrs. 
30 m., became so strongly inflected that it was converied into a 
cup. The power of urine does not lie in the urea, which, as 
we shall hereafter sce, is inoperative. 
Aljumen (fresh from a hen’s egg), placed on seven leaves, 
caused the tentacles of six of them to be well inflected. In one 
case the edge of the leaf itself became much curled im afier 
20 hrs. The one leaf which was unaffected remained so for 
96 brs, and was then treated with a drop of milk, and this 
taused the tentacles to bend inwards in 12 hrs. 
Cold Filtered Infusion of Fz - Mext—This was tried only on a 
single leaf, which had most of its outer tentacles and the blade 
inflected in 19 brs. During subsequent years, I repeatedly 
used this infusion to test leaves which had been experimented 
