C +31 ] 
pity that this truly learned and elegant writer was 
not more accurate in his tryals than he appears to 
have been. Many of his experiments having indeed 
been made in fo lax and improper a manner, and 
fo many errors having been committed in them, 
that one can not with fecurity depend upon thefe 
tables, tho’ containing otherwife facts one would 
fo much defire to be truly informed about. 1 
have however here inferted the fcveral particulars 
of his two laft tables, which immediately concern 
Specific Gravities, after correcting fuch errors in 
calculation as I could certainly come at : And I 
hope that I fhall be excufed for this free cenfurc 
upon part of the works of a gentleman, who 
has fo well deferved of the learned world, and ac- 
quired fo juft a reputation in it. 
James Jurin, M. D. and feveral years Secretary 
of the Royal Society, gave, in N°. 361 of the SPht- 
lofophical Tranfaffions , A°. 1719, fome original 
and very accurate experiments made by himfelf, upon 
the Specific Gravity of Human Blood, at feveral 
times during the fix preceding years. Thefe were 
accompanied with a very curious difeourfe, which 
has fince been tranflated by himfelf, into Latin , and 
reprinted in his Differtationes Rhyfico Mathematic 
Lond. 1732. 8°. 
This gentleman has alfo, in N°. 369 of the fame 
Tranfaftions , obliged us with fome very judicious 
and ufeful remarks, relating to the caution to be 
ufed in examining the fpecific gravity of folids , by 
weighing them in water > for want of attending to 
which, feveral forts of bodies, fuch as human Cal- 
L 1 1 culij 
