Néw Publications. 185 
“We miay therefore conclude from thefe experiments *, 
that at the fame heat a body enclofed in charcoal does not 
receive but about two-thirds of the heat of a body furrounded 
by quartzeous fand ; that the reduction of metals, which do 
not melt but at a heat of 130 degrees, cannot be effected in 
charcoal ; that pyrometrical pieces do not enable us to 
judge with correctnefs of the heat communicated, but iz 
fo far as they are in contact with {ubftances fimilar to thofe 
which furround the bodies fubjected to it, or with bedies 
equally conductors ; lafily, that with thefe alterations we 
may make an advantageous ufe of this inftrument, 
NEW PUBLICATIONS. 
Atti della Real Socicta Economica di Firenze offia de’ Georgo- 
fii. Tranfactions of the Royal Economical Society “of 
Florence, &e, Vol, il. 1795. Vol. ILL. 1796. vo. 
2 
Ix the fecond volume of this work, after a continuation 
of the hiftory of the Society, the following account is given 
pf the life and fervices of Profeffor John. Targioni Tozetti 
and of Saverio Manetti. The former was born at Florence, 
where his father was a phyfician, on the 12th of Septem-. 
ber 1712. In the year 1734 he received the degree of doc- 
tor, and foon afier was appointed profeffor. He purchafed 
the library and manufcripts of Micheli, his tutor, who died 
in 1737, with an intention of publifhing a complete collec- 
tion of the latter. He was afterwards named infpeétor of 
the public library, from 110 manufcripts, in which he pub- 
lithed the letters of different learned men to Magliabechi ; 
but, for want of encouragement, only five volumes were 
printed. Befides his well-known Travels, he intended ta 
* For the reafon given in a former note, the author’s conclufions cannot 
be admitted. Nay, they are quite erroneous. He has notat all attended 
to the only faét proved by his experiments—that a given quantity of heat 
will not pafs in the fame time through bodies poffeffing different conducting 
Peers. Epir. 
have 
