144 DROSERA ROTUNDIFOLIA. [Cuar. VIII. 
the dose, though only the ;1; of a grain (-185 mg.), was evidently 
too strong, for three of the seven well-inflected leaves were killed. On 
the other hand, one of the seven, which had only a few tentacles 
inflected, re-expanded and seemed quite healthy after 48 hrs. By 
employing a weaker solution (viz. one part to 457 of water, or 1 gr. to 
1 0z.), doses of 545 of a grain (0675 mg.) were given to six leaves. 
Some of these were affected in 37 m.; and in 8 hrs. the outer tentacles 
of all, as well as the blades of two, were considerably inflected. After 
23 hrs. 15 m. the tentacles had almost re-expanded, but the blades of 
the two were still just perceptibly curved inwards. After 48 hrs. all 
six leaves were fully re-expanded, and appeared perfectly healthy. 
Three leaves were immersed, each in thirty minims of a solution of 
one part to 875 of water (1 gr. to 2 0z.), so that each received 3} of a 
grain (2°02 mg.); after 40 nı. the three were much affected, and 
after 6 hrs. 45 m. the tentacles of alland the blade of one closely 
inflected. 
Sodium, Nitrate of (pure).—Half-minims of a solution of one part 
to 437 of water, containing 515 of a grain (+0675 mg.), were placed on 
the discs of five leaves. After 1 hr. 25 m. the tentacles of nearly all, 
and the blade of one, were somewhat inflected. The inflection 
continued to increase, and in 21 hrs. 15 m. the tentacles and the blades 
of four of them were greatly affected, and the blade of the fifth to a 
slight extent. After an additional 24 hrs. the four leaves still 
remained closely inflected, whilst the fifth was beginning to expand. 
Four days after the solution had been applied, two of the leaves had 
quite, and one had partially, re-expanded ; whilst the remaining two 
remained closely inflected and appeared injured. 
Three leaves were immersed, each in thirty minims of a solution of 
one part to 875 of water; in 1 hr. there was great inflection, and after 
8 hrs. 15 m. every tentacle and the blades of all three were most 
strongly inflected. 
Sodium, Sulphate of.—Nalf-ninims of a solution of one part to 437 
of water were placed on the discs of six leaves. After 5 hrs. 30 m. the 
tentacles of three of them (with the blade of one) were considerably, 
and those of the other three slightly, inflected. After 21 hrs. the 
inflection had a little decreased, and in 45 hrs. the leaves were fully 
expanded, appearing quite healthy. : 
Three leaves were immersed, each in thirty minims of a solution of 
one part of the sulphate to 875 of water; after 1 hr. 30 m. there was 
some inflection, which increased so much that in 8 hrs. 10 m. all the 
tentacles and the blades of all three leaves were closely inflected. 
Sodium, Phosphate of.—Half-minims of a solution of one part to 
437 of water were placed on the discs of six leaves. The solution acted 
with extraordinary rapidity, for in 8 m. the outer tentacles on several 
of the leaves were much incurved. After 6 hrs. the tentacles of all six 
leaves, and the blades of two, were closely inflected. This state of 
things continued for 24 hrs., excepting that the blade of a third leas 
became incurved. After 48 hrs. all the leaves re-expanded. It is 
