32 DR. A, D. WALLER ON THE 
Number of ticketed sheets in the Wallichian Herbarium ... 48 
» species from Malabar ................. + Leeeeeeaeaens 18 
» » » Nepal ..... RH 18 
» » » Bilhet ............eeeeee e 10 
» " », Burma (Rangoon, Prome, Tavoy).. 6 
» » , Birmore ....... etre 2 
102 
Species common to Nepal, Sirmore, Malabar, Silhet, and Burma, 
1 (I. Balsamina). 
Silhet and Malabar, 4 (I. Balsamina, chinensis, 
natans, i. e. Hydrocera triflora). 
Nepal and Sirmore, 2 (I. Balsamina, scabrida). 
Morung and Silhet, 1 (I. Jurpia, Ham). 
On the Blaze-Currents of Vegetable Tissues: a Week's Holiday 
with a Galvanometer and some Plants. By A.D. Wanter, 
M.D., F.R.S. (Communicated by Prof. J. B. Farmer, 
F.R.S., F.L.S.) 
[Read 16th June, 1904.] 
$1. Frrst Day.—I set up the galvanometer and keyboard in a 
convenient corner of the room, and verify the circuit. 
The two unpolarizable electrodes À and B and the galvano- 
meter are couneeted with the central keyboard in such a way 
that current from B to A through an interposed object shall 
give deflection of the galvanometer-spot to my right, which 
I call the ** positive " direction. 
The compensator and the induction-coil are likewise connected 
with the central keyboard, with a reverser in each of these two 
circuits, so disposed that its position towards the right and left 
indicates “ positive" and “ negative" directions of current. For 
the induction-coil, this convention is made to apply to the break 
current. Its reverser is placed in the primary circuit, and the 
latter also includes a double-contact key ; so that we may take 
at will either single currents or alternating (tetanising) currents. 
The direction of the latter is indicated by the position of the 
reverser ; if it is, e.g., tilted to the right, we know—or can at 
once verify—that the break current passes through the object 
under examination in the “ positive” direction from B to A. 
Finally, I verify the conventional “ positive " and “ negative " 
direetions between B and A by touching B with a bit of zine, 
