1809.] 
It is computed, on the lowest calcula- 
tion, thatthere are not less than thirty 
conv verted Jews of both sexes in his Ma- 
Jesty’s dominions, At the last meeting 
of the. missionary society was read a 
letter from Berlin, acquainting them that 
two learned Jews had embraced Chris- 
tianity in that city, and were desirous of 
coming to England, for the purpose of 
preaching to their brethren. The London 
Society for promoting Christianity ameng 
the Jews has. advertised a’ premium of 
30 guineas for the best refutation of the ' 
Jate Mr, David Levi’sDisseitation, on. 
the Prophecies, to be produced within 
the present year. 
In the committee of the House of 
Commons, on Mr... Winsor’ proposed 
Bill for forming a company to prosecute 
his scheme of gas lights, Mr. W. Cox, an 
eminent chemist, delivered a report, from 
which it appears that many tons of human 
bones are annually sent by sea from , 
the metropolis to the North, where they 
are ground, or rather broken small, in 
mills contrived for the purpose, and then 
used as a manure. 
A mine of zinc ore has been discovered 
on Lord Ribblesdale’s estate, in Craven, 
Yorkshire, where there were formerly 
copper mines. This ore has been used 
as a substitute in painting for white lead, 
the color of which it attains by long ex- 
posure: it does not blister, is more ad- 
hesive, and is not decomposed by salt 
water. ‘This mineral is found in strata 
at the bottom of caverns, about 8 fathoms 
from the surface, in soine places 6 feet 
thick. One of the caverns is 104 yards, 
anos 84, athird 40 yards in length, 
and about 14 yards wide. It is sup- 
posed to have been sublimed by a vol- 
cano, as the stones surrounding it have 
been vitrified. About 2000 tons of it 
have been sold at trom 5l. to 101. to 
make brass when mixed with copper, 
exclusive of what has been used for 
painting, 
followed by others of a like kind, 
_ that there’ should bea full supply of a 
mineral, arid it should be found to answer 
the purposes required, it is possible that 
the use of white lead’ as paint, with its 
“deleterious effects, My be in a great de- | 
gree superseded. 
Dr. Woxrasron has been led, by Mr, 
Davy’s experiments on the separation 
and transter of chemical agents by means 
_of the Voltaic apparatus, to imagine 
it probable, that animal secretions are 
effected by the agency of asimilar electric 
‘power, In this. opinion he is supported 
foal 
' 
. 
ia 
If this discovery should ae 
Literary and Philosophical Intelligence, ue 
by the following experiment :—He took 
a piece of glass tube about three quarters 
of an inch in diameter, and nearly two 
inches fong, open at both ends; and 
covered one of them with a piece of 
clean bladder. Into this little vessel he 
poured some. water, in which had been 
dissolved 545 of its weight of salt; and 
after placing it upon a sh ling, with the 
bladder slightly moistened externally, he 
bent a wire of zinc, 80 that while one 
extremity rested cn the shilling, the— 
other might be immersed about an inch 
in the water. By successive examination 
of the ‘external surface of the bladder, 
he found that even this feeble power oc- 
casioned soda to be separated from the 
water, and to transude through the sub- 
stance of the bladder. The presence of 
alkali was discernible by the application 
of reddened litmus paper, after two or 
_three minutes, and was generally mani- 
fest even by the test of turmeric before 
five minutes had expired. This experi- 
ment tends to confirm the conjecture, 
that similar agents may be instrumental 
in effecting the various animal secretions 
which have not yet been otherwise ex- 
plained. The qualities of each secreted 
fluid may hereafter instruct us in the 
species of electricity that prevails in . 
each organ of the body. 
Mr. Jamrs Vuomson, of Church 
Bridge, near Blackburn, in Lancashire, 
has made’ various experiments on the 
sulphate of barytes. His analysis of that 
substance confirms with trifling variation 
the results already obtained by Wither- 
ing, Kirwan, Clement and Desormes, 
and prove—1. That carbonate of barytes, 
both native and artificial, is composed‘of 
carbonic acid 21, 75, barytes 78, 25.— 
2. That nitrate ‘of Larytes is composed 
of acid and water 40, 7, barytes 59, 3.— 
3. That calcined sulphate of lime con- 
tains sulphuric acid 58, lime 42.—4, and 
lastly, That calcined sulphate of barytes 
is composed of sulphuric acid 33, ‘ba- 
rytes 67. 
From a series of experiments on the 
germination ,of seeds, instituted by Mr. 
J. Acron, of Ipswich, it appears, that 
when germinating seeds are first placed 
in oxigen gas, a considerable absorpuon 
takes place ; the quantity being regulated 
by the state of the seeds and the tem- 
perature of the atmosphere. In one exe 
pernnent the absorption in eleven hours 
was 1, 60 cubic iiches, being nearly one 
third of the quantity employed. 
An observer states, that the white 
smoke arising from a lead fur nace, during 
the 
Ae et 
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