ae 
4.62 
Zlve them every poffible publicity. The 
Proofs are ¢ . 
iit, « Of 6000 vaccinated at Conftantino- 
ple, not one has taken the plague. 
2d, ‘That infants previoufly vaccinated have 
fucked without injury che milk of nurfes in- 
fected with the plague, 
39, “€ That an Italian phyfician, Dr. Valli, 
who went to Conftantinople to ftudy the 
plague, was fo perfuaded of the truth of the 
ew cilcovery, that, upon the fole fecurity of 
having Seen vaccinated, he fhut himfelf up 
#n a jazaretto, and had with people attacked 
with carbuncles and buboes various modes 
of contact, without any effe&. 
: 4th, * That the fame Dr. Valli inferted 
Into his own hand, a mixture of variolous 
and pcfilential virus, and having felt no ef- 
fect from that trial, he meant the following 
week to infert peftilential virus alone, 
Sth, ** That Dr. Auban, having been in- 
formed that in fome villages near Conftanti- 
nople the cows were fubje& to fome eruptions 
on their udders 5 he, with feveral other gen- 
tlemen of the French embafly, went to thofe 
Villages, and found the cow-pox then exift- 
ing. The report of the inhabitants was, that 
they had never feen the plague or the fmall- 
pox among them, though both thefe difeafes 
made dreadful ravages in the vicinity. 
«¢ Such, my dear Sir,’ continues Dr, De 
Carro, ¢¢ are the extraordinary faéts which 
have been communicated to me. I have 
now and then correfponded with M. M. La- 
font and Auban3; their correfpondence an- 
hounctes much medical information. The fe- 
Cond, acquainting the world with fuch an 
important difcovery, runs certainly a great 
risk if he deceives it by falfe and hafty ob- 
fervations,” 
A beautiful Map of the Plain of Troy, 
and the Diftri& of Ida, with the Sources 
of the Simc¥s and Scamander, from an 
actual furvey made by Kauffer, is about 
to be publithed by Mr. ARgowsMirH, 
on a fingle theet. 
Mr. Arruur Woo te has difcovered 
a method of equalizing the motion of a 
Steam-engine, without a fly-wheel. It 
poflefies the power alfo of being ftopped 
and fet to work at any part of the firoke; 
the utility of which, in mines, collieries, 
and other works, will be inftantly felt by 
thofe converfant in fuch undertakings. 
Mr. Freper:cKx Accum has invented 
an apparatus for drying the Produé&s of 
Chemical Analyfis; fuch as fulminating 
mercury, Chenevix’s fulminating filver, 
and other explofive compounds. The fame 
apparatus, differently applied, is found to 
be extremely ufeful for experiments of 
congelation. 
The prefent Emperor of Ruffia diftin- 
guuhes himielf as the avowed patron of 
Literary and Philofephical Intelligences 
[Dees 1, 
{ctentific and literary characters, Proe 
feflor HORNER, who is engaged in aftro- 
nomical obfervations, receives 300 ducats 
a year during his labours, with a promife 
of a penfion of 300 ducats as long as he 
choofes to remain in Ruffia. 
The Moniteur bas been lately reprinted 
at Milan; it confifts of 32 volumes; thofe 
articles that related merely to temporary 
circumftances, have been judicioufly omit- 
ted tn this edition. _ 
The bookfellers of Berlin have publifhed 
‘¢F. H. M. Ernefti Clavis Horatiana, five 
Indices rerum et verborum philologico-critici 
in Opera Horatii, premiffis ad leficnen 
ufumque Poet@a neceffartis.” 
A Gentleman at Peterfburgh has in- 
vented an inftrument for taking the Lon- 
gitude and Latitude with more facility 
and precifion than has hitherto been at- 
tained. 
The late eclipfe of the Sun was obferved 
at Tangiers by AL1 Berk ABDALLAH, a 
young Moor, with one of Dollond’s tele- 
icopes; from whom we learn, that the 
fun appeared eclipfed above a hill which 
inter‘ected the horizon at r7h. 24m. 13f. 
A large fpot, which was fituated near the 
fun’s centre, emerged from the fhadow at 
18h. 28m. 25f.; and the end of the eclipfe 
(the exterior contact) 19h. 14m. 15f. The 
part eclipfed feemed to be about 8 digits. 
He propofes to determine, from thefe ob- 
fervations, the longitude and latitude, of 
which, as yet, he has enly an approxima. 
tion. M. De Lalande, who obferved the 
eclipfe at Paris, has deduced from it, that 
the difference of meridian between that 
city and Tangiers is 33m. 12f. in time, 
which is only 32 feconds more than it was 
fuppoled to be kefore. 
M. Ritter, of Jena, has made a nume 
ber of experiments with a view of com- 
paring the eleCtricity of Volta’s Pile with 
that of electrical machines. In thefe he 
confiders fucceffively the intenfity of elec- 
tricity, chemical action, fpark, and fhock, 
in the pile. It appears, 
That the electricity is pofitive at one of the 
poles of the pile, and negative at the other 5 
that it diminifhes between thefe extremes, fo 
as to be nothing in the middle of the pile. 
The aftion of the pofitive pole difpofes metals 
. to combine with oxygen, and that of the ne- 
gative pole difpofes them to combine with 
hydrogen, If the pofitive pole be armed with 
a yold leaf, and the negative witha bit of 
charcoal, on forming a eommunication be 
tween the two fubftances, the gold leaf burns 
with a brilliant light, and the charcoal re- 
Mains untouched: but if the charcoal be 
placed en the pofitive fide, and the gold a 
| the 
