Cuap. VII. CARBONATE OF AMMONIA. 143 
analogous cases with air thoroughly permeated with 
the vapours of chloroform and ether. 
Minute particles of the carbonate were added to the 
secretion surrounding several glands. These instantly 
became black and secreted copiously; but, except in 
two instances, when extremely minute particles were 
given, there was no inflection. This result is analo- 
gous to that which follows from the immersion of 
leaves in a strong solution of one part of the carbonate 
to 109, or 146, or even 218 of water, for the leaves 
are then paralysed and no inflection ensues, though 
the glands are blackened, and the protoplasm in the 
cells of the tentacles undergoes strong aggregation. 
We will now turn to the effects of solutions of the carbonate. 
Half-minims of a solution of one part to 437 of water were placed 
on the discs of twelve leaves ; so that each received 54, of a grain 
or ‘0675 mg. Ten of these had their exterior tentacles well 
inflected ; the blades of some being also much curved inwards. 
In two cases several of the exterior tentacles were inflected in 
35 m.; but the movement was generally slower. These ten 
leaves re-expanded in periods varying between 21 hrs. and 
45 hrs., but in one case not until 67 hrs. had elapsed; so that 
they re-expanded much more quickly than leaves which have 
caught insects. 
The same-sized drops of a solution of one part to 875 of water 
were placed on the discs of eleven leaves; six remained quite 
unaffected, whilst five had from three to six or, eight of their 
exterior tentacles inflected; but this degree of movement can 
hardly be considered as trustworthy. Each of these leaves 
received y5 of a grain (°0337 mg.), distributed between the 
glands of the disc, but this was too small an amount to produce 
any decided effect on the exterior tentacles, the glands of which 
had not themselves received any of the salt. 
Minute drops on the head of a small pin, of a solution of one 
part of the carbonate to 218 of water, were next tried in the 
manner above described. A drop of this kind equals on an 
average >, 0f a minim, and therefore contains -3;5 of a grain 
(0135 mg.) of the carbonate. I touched with it the viscid 
secretion round three glands, so that each gland received only 
