546 
Solutions in Water of — 
Carbonate of Potash (strong), - 310 
Caustic Soda (strong), . — 40 ) ^ 
Do. (dilute), . — 25 j 
Caustic Potash (combustion ) , 
strength), . . } + 150 
Nitric Acid (strong), . + 7*5 
Do. (1 in 4 of water), — 35 
Hydrochloric Acid (strong), — 160 
Do. (weak), — 50 
Sulphuric Acid (strong), +15 
Strong solution of Na Cl . — 400 
Do. KI . - 80 
Do. CitO,S0 3 - 1000? 
Solution of double Oxalate of ) , 
Chromium and Potash, j ^ effect 
Fe 2 Cl , solution moderate, Negative effect 
Acetic Acid (Monohydrate), + 3 
Acetic Anhydride, . — 9 
The sulphate of copper solution is by far the most remarkable 
that we have tried. The smallest globule, on leaving the spheroidal 
state, gave intense effects, sending the lamp image entirely off 
the scale. 
We have also commenced a set of experiments with a view to 
test the electricity developed during the brisk disengagement of a 
gas by chemical action, which was discovered eighty years ago by Volta. 
In some of these experiments it was observed that when the gases 
were disengaged with considerable effervescence, and in a mass of 
large bubbles foaming over the platinum crucible in which the ex- 
periment was conducted, the bursting of each bubble was attended by 
a simultaneous increase of deflection in the electrometer. These ex- 
periments are, as yet, exceedingly imperfect, but they seem, like the 
preceding, to indicate friction as a main cause of the observed results. 
The effects on the electrometer are by no means so uniform, either 
as to kind or quantity of electricity, as those given by evaporation. 
Electricity developed during Effervescence. 
Zn + HCl . 
Zu, + NO-HO 
Mn0 2 + HCl . 
Ca 0,C0 2 + HC1 . 
Na 0,S0 2 + HC1 . 
Na Cl + SO a HO 
- 750 
+ 175. In another trial - 120 
- 150 
Trifling effects 
J At first a small negative deflection, 
( finally +50 
+ 10 
* This is a very difficult substance to experiment upon. 
