GALVANISM. 
the process be continued, that of z becomes 
green, and c red. 
Galvanism, as a source of light and heat. 
Batteries of great dimensions, such as 
contain from 5,000 to 10,000 square inches 
each, of zinc and copper surface, are capa- 
ble of furnishing abundance of sensible 
heat and much light. If the connection be- 
tween the two ends of the battery be made 
by a very small wire, such as the fine watch- 
spring wire, the wire becomes red-hot 
for a considerable length, and if the power 
of the battery be great, it becomes white- 
hot and ultimately fused. 
Let the end of the wives of the battery 
be each provided with a pair of tweezers, 
one pair of which being insulated from the 
hand by covering the surface with dry 
cloth ; place between each pair of tweezers 
a small bit of charcoal, made in a close ves- 
sel, from box-wood, or lignum vita?. The 
moment the contact is formed between the 
bits of charcoal, a vivid light is produced, 
much more brilliant than that occasioned 
by burning in oxygen. If the contact be 
frequently severed by a sort of tremulous 
motion, the light may be kept up for some 
time. 
The foils and small wires of metals are 
deflagrated by placing them in the current. 
Let one of the conducting wires be brought 
in contact with an iron dish, filled with 
mercury. Let the foil or small wires be 
attached to the other conducting wire, and 
be brought in contact with the surface of 
the mercury, which constantly presenting 
a clear surface, is very convenient in these 
experiments. A very brilliant effect may 
also be produced, by presenting the foils to 
the surface of a sheet of tinsel. 
In inflaming oils, alcohol, &c. by galva- 
nism, some thin metallic substance, or a 
small piece of charcoal, should be covered 
with the substance to be inflamed. The 
moment the contact is made, as in defla- 
grating the metal, the oil takes fire. 
The galvanic spark, with great facility, fii es 
a mixture of oxygen and hydrogen gases. 
A very brilliant discovery has lately been 
made by Mr. Davy, Professor at the Royal 
Institution, and confirmed by others, which 
consists in the decomposition of the two 
fixed alkalies. It is performed by placing 
a bit of the alkali in the solid state, and a 
little moistened, upon a plate of platina, 
connected with one end of the battery, 
and bringing into contact with it another 
piece of platina, from the other end of the 
battery. A portion of black matter is soon 
formed, in which is found imbedded small 
metallic globules ; which substance is found 
to be the base of the alkali, and has been 
deprived of its oxygen by the galvanic 
agency. These g'obules are so inflamma- 
ble, as to decompose water, with a brilliant 
flash and slight explosion. See Alkali. 
This discovery will be of great impor- 
tance to chemistry, and will probably soon 
make a serious change in its arrangement 
and nomenclature. 
GAMBOGE, is a substance obtained 
from the stalagmites cambogioides, a tree 
that grows wild in the East Indies ; from 
which it is had by wounding the shoots. 
It is brought here in large cakes, which are 
yellow, opaque and brittle. With water 
it forms a yellow turbid liquid used in 
painting. In alcohol it is completely dis- 
solved. If taken internally it operates 
violently as a cathartic. 
GAME. It is a maxim of the common 
law, that goods of which no person can 
claim any property belong to the King by 
his prerogative : hence those animals ferae 
naturae, which come under the denomina- 
tion of game, are styled in our laws his Ma- 
jesty’s game ; and that which he has he may 
grant to another ; in consequence of which 
another may prescribe to have the same 
within such a precinct or lordship. And 
hence originated the right of lords of ma- 
nors, or others, to the game within their 
respective liberties. For the preservation 
of these species of animals, for the recrea- 
tion and amusement of persons of fortune, 
to whom the King has granted the same, 
and to prevent persons of inferior rank from 
misemploying their time, the following acts 
of parliament have been made. The com- 
mon people are not injured by these re- 
strictions, no right being taken from them 
which they ever enjoyed ; but privileges 
are granted to those who have certain qua- 
lifications therein mentioned, which before 
rested solely in the King. To entitle any 
one to kill game, he must now take out a 
certificate, upon which a stamp duty is 
payable. These certificates are to be dated 
the day of the month when issued, and shall 
be in force till the first of July following, 
and no longer; and if any clerk of the peace, 
his deputy, or steward, clerk, &c. issue 
certificates otherwise than directed, to for- 
feit 20 1. 25 Geo. III. sess. 2. No per- 
son to destroy game until he has delivered 
an account of his name and place of abode 
to the clerk of the peace, or his deputy, or 
