176 DROSERA ROTUNDIFOLIA. Cuar. VIIL 
Sodium, Carbonate of (pure, given me by Prof. Hoffmann).— 
Half-minims ( 0296 ml.) of a solution of one part to 218 of 
water (2 grs. to 1 0z.) were placed on the discs of twelve leaves. 
Seven of these became well inflected; three had only two or 
three of their outer tentacles inflected, and the remaining two 
were quite unaffected. But the dose, though only the zi, of a 
grain (-1385 mg.), was evidently too strong, for three of the 
seven well-inflected leaves were killed. On the other hand, ono 
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 437 of water, or 1 gr. to 
1 oz.), 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 con- 
siderably 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 solu- 
tion of one part to 875 of water (1 gr. to 2 0z.), so that each 
received ; of a grain (2:02 mg.); after 40 m. the three were 
much affected, and after 6 hrs. 45 m. the tentacles of all and 
the blade of one closely inflected. 
Sodium, Nitrate of (pure).—Half-minims of a solution of one 
part to 487 of water, containing 51, of a grain (‘0675 mg.), 
were placed on the discs of five leaves. After 1 hr. 25 m. tho 
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 solu- 
tion of one part to 875 of water; in 1 hr. there was great inflec- 
tion, and after 8 hrs. 15 m. every tentacle and the blades of all 
three were most strongly inflected. 
Sodium, Sulphute of —Half-minims of a solution of one part 
to 487 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. 
