Guar. VIL OTHER SALTS OF AMMONIA. 167 
becoming more inflected. After 23 hrs. three of the leaves had 
their blades somewhat inflected; and the submarginal tentacles 
of all considerably inflected, but in none were the two, three, or 
four outer rows affected. I have rarely seen cases like this, 
except from the action of a decoction of grass. The glands on the 
discs of the above leaves, instead of being almost black, as after 
the first hour, were now after 23 hrs. very pale. I next tried 
on four leaves half-minims of a weaker solution, of one part to 
1812 of water (1 gr. to 8 0z.); so that each received zy45 of 
a gtain (0225 mg.). After 2 hrs. 18 m. the glands on the disc 
were very dark-coloured ; after 24 hrs. two of the leaves were 
slightly affected ; the other two not at all. 
Acetate of Ammonia.—Half-minims of a solution of about one 
part to 109 of water were placed on the discs of two leaves, both 
of which were acted on in 5 hrs. 30 m., and after 23 hrs. had 
every single tentacle closely inflected. 
Oxalate of Ammonia.—Half-minims of a solution of one part 
to 218 of water were placed on two leaves, which, after 7 hrs., 
became moderately, and after 23 hrs. strongly, inflected. Two 
other leaves were tried with a weaker solution of one part 
to 437 of water; one was strongly inflected in 7 hrs.; the other 
not until 80 hrs. had elapsed. 
Tartrate of Ammonia,—Half-minims of a solution of one part 
to 487 of water were placed on the discs of five leaves. In 
31 m. there was a trace of inflection in the exterior tentacles of 
some of the leaves, and this became more decided after 1 hr. 
with all the leaves; but the tentacles were never closely iu- 
flected. After 8 hrs. 80 m. they began to reexpand. Next 
morning, after 23 hrs., all were fully re-expanded, excepting 
one which was still slightly inflected. The shortness of the 
period of inflection in this and the following case is remark- 
able. 
Chloride of Ammonium, — Half-minims of a solution of one 
part to 437 of water were placed on the discs of six leaves. 
A decided degree of inflection in the outer and submarginal 
tentacles was perceptible in 25 m.; and this increased during 
the next three or four hours, but never became strongly marked. 
After only 8 hrs. 30 m. the tentacles began to re-expand, and 
by the next morning, after 24 hrs., were fully re-expanded on 
four of the leaves, but still slightly inflected on two. 
General Summary and Concluding Remarks on the 
Salis of Ammonia.—We have now seen that the nine 
12 
