5 
~ 
1799.) 
‘and % fromthe drop 2" 11/18”, 5, and two 
feconds more from the ftreak of light. He 
has calculated the farne from: the obferva- 
tions at Ofez, as follows: 2% 22' 1%, 3, 
after Bauna’s obfervations, 1”, 1 more 
than after thofeof Taucuer. ‘The ra- 
-dius ©, here fuppofed — 15° 50”, 9, and 
ad 
that of &6 = 5”, 5 has been found by 
him by a number of obfervations made 
on the fpot. For Viennz, he found the 
time by other means, By ten obferva. 
tions, made with the objective-micrometre, 
he obtained the fmallett diftance of the cen- 
tres, as feen from the centre of the earth, 
5 40”, 8. This diftance, compared with 
feveral other diftances before and after the 
medium of the tranfit, proved the time of 
the medium of the tranfit to have been 
In 55°37") 6. By means of the fame 
finalleft diftance of the centres, he found 
the apparent geocentric latitude of $ in 
oS = 5 46’, 5, the trueone 5’49”, 8, and 
the difference between the conjunétion and 
the medium of the tranfit = 627, 81, in 
time 15° 41", @. Confequently the ap- 
parent conjunction at 22 a2’ 19", 5. From 
this he computed the heliocentrical latitude 
in gto be 7’ 4", 8, S. longitude (2 8 = 
a* 6% 5H Ay’, 16- 
Dr. Pgearson’s ** Nomenclature of the 
Nezv Chemifiry” being out of print, it is now 
reprinting, and will be iflued in Oétober 
next for the ufe of his pupils in particular, 
and the public in general. In this edi- 
tion will be added Bergman’s Tables of 
fingle and double eleétive attraction, 
with new columns and inftances in the 
prefent langu2ge of chemiftry. The che- 
mical fymbols of Geoffroy, Bergman and 
the French academicians will alfo be 
printed in tables, as well as the tables of 
affinities, denoted numerically by WKir- 
wan, and the fingie and compound attrac- 
tions be illuttrated by fymbolical diagrams. 
The celebrated Mr. Kirwan of Dub- 
lin is now in Londoa, and occupied in 
printing and preparing for the prefs, three 
works ; 1. On Mineral Waters. 2. Geo- 
lozical Obfervations: 3. A Treatife on 
Affinities, andthe real quantities of Acids 
and Bafes in Double Salts. 
The Medical and Chemical Leftures at 
St. George’s Hofpital and Leicefter-fquare, 
byDr.Ps arson, commence inthe firlt week 
ct OStober next, at the laboratory in Whit- 
comb-ftreet, Leicefter-fquare. “The Lec- 
tures on the Materia Medica are given in 
a morning from a quarter before to half 
after eight; on the Pradtice of Fhyfic from 
half after eight to a querter after nine; 
and from a quarter after nine to tén every 
day, but Saturday morning, whena Cli 
— 
MONTHLY Mac. No. XLIx. 
Literary and Philofophical Intelligence. 
bs 
nical Leéture is given from nine to ten,— 
A regifter is kept of the cafes of Dr) Pe ar- 
Son’s patierits in-St. George’s Hofpital, 
and.an account is given of them at the Cli- 
nical LeSture. Propofals may be had in. 
Leicefer-fouare, and at St. George’s 
 Hofpital. 
Mr. Epwarp Howarp has lately dif- 
covered a Fuhninating Mercury, the exact 
preparation of which is not yet made pub- 
lic, but the effe&ts are very wonderful.— 
Two grains lai! on an anvil and ftruck 
with a cold hammer exploded with a ftun- 
ning noife and concuflion. Both a powder- 
proof anda mutket-barrel were burft by a 
few grains of this deftru€tive compound. 
It explodes at about 400 degrees of Fah- 
renheit.. We hope we fhall foon have 
_ more particulars concerning this curious 
- difcovery. . 
Kasretyn has publifhed the method 
of manufacturing the beautiful pigment 
called Bruniwick Green, which is much - 
ufed on the Continent for oil-painting and ' 
rinted paper. Shavines of copper are 
pat s 
put into a clofé vefiel and fprinkled with 
a {olution of muriate of ammonia (crude 
fal ammoniac). The copper appears to 
be firfk diffolved by the acid and then pre- 
cipitated by the volatile alkali in this pro- 
cefs. The precipitate is wathed and dried 
upon cloth er in wooden boxes. . ‘Three 
parts of the muriate of ammonia are fut~ 
ficient for two of copper, and they pro- 
duce fix parts of colour. 
The return of that dreadful fcourge of 
the United States, the yellow fever; in the 
fummer of 1798, and its extenfive range, 
have fail] turned the public attention to- 
wards this important fubject., The faéts 
appear to. be as follows:—The’ difeafe 
broke out in -Philadelphia, -New York, 
Bofion, New Lendon, and many even of 
the mot healthy towns in the Northern 
States. Jt is to be remarked, that the 
fummer was exceflively dry and fultry, 
and the average of the thermometer during 
the fummer meohths much higher than 
ufual. A pretty general opinion feems to 
be prevauing, that in ail thefe inftances 
the difeafe was not imported by any con- 
tagion, but produced in each place by a 
variety of putrefcent animal matter; in 
Botton efpecially, by a large quantity of 
raw hides and ill-cured tifh and beef, 
which remained during the whole fum- 
mer in-warehoufes, owing to a prohibition 
of all exportation to the French Weft In- 
dia Iflands In Philadelptia, ‘however, 
the opinion of the importation of the dif- 
eafe appears to be very prevalent, infos 
much that, in a public letter from that city 
4N to 
637 
