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culi, (he fubflance of all woods, ire. have appeared, 
troni their pores and fmall cavities filled up with 
air, to be confidcrably lighter than they really arc. 
John Woodward M. D. and ProfcfTor of Phyfic 
in Grefham College , had, as he acquaints us in 
lever al places of his works, made a great num- 
ber of experiments upon the fpecific weights, of 
mineral and other foffii bodies, but which being 
probably contained in thofe of his papers which he 
ordeied to be lupp relied at his death, are thereby 
loft to the world, to which they would without 
nil doubt have been very acceptable. All 1 have 
been able to pick up are a very few mentioned in 
the Catalogue of the Englijh FoJJils in his Collett ion, 
published iincchis deceal'c, in 8°. at JLondon 1729. 
. lMr - Gabriel Fahrenheit F. R. S. communicated, 
o- ?/ * ^ 3 * t ^ c Phifofophical Tranfattions , A 
Fable of the Specific Gravities of 2 8 fever al finb- 
flances, from hydroftatical experiments of his own, 
made with great care and exadnefs; to which he 
fub joined fome observations upon the manner in 
which his trials were performed, together with a 
defeription of the inftruments in particular which 
he made ufe of to examine -the gravities of Fluids. 
To fome of his experiments which he thought re- 
quired a greater nicety, he has affixed an aftcrisk in 
his table, fignifying fuch to have been adjufted to 
the temperatuic of the air, when his Thermome- 
ters flood at the height of 48 degrees. This gen- 
tleman, who is well known by the reputation of 
lus -Mercurial Thermometers, which he made with 
