[ 4^3 ] 
D°. Oxf. Soc. C. 
• 
• 
0.600 
Rad. Gentianx. Freind. 
• 
0.300 
Cortex Peruvianus. Freind. 
r 
• 
°-734 
Crabtree meanly dry. Oxf. Soc. 
• 
0.761 
Yew, of a knot or root 16 years old. 
Oxf 
Soc. 
• 
« 
0.760 
Maple dry. Oxf. Soc. C. 
« 
Plumtree dry. J. C. 
♦ 
« 
0.663 
Fir, dry yellow. L. 
• 
* 
0.65-7 
Dry white Deal. L. 
• 
• 
0.569 
Lignum Abietin. Freind. 
• 
• 
Fir dry. Cotes. 
• 
n 
0.550 
D». Oxf. Soc. 
• 
0.546 
Walnut tree dry. Oxf. Soc. 
• 
• 
0.631 
Cedar dry. Oxf. Soc. 
• • 
0.613 
juniper wood dry. J.C. 
• 
0.556 
Safiafras wood. J. G. 
* 
• 
0.482 
Cork. Cotes. . * . 
• 
1 
0.240 
D°. J. C, 
« 
• 
°- 2 37 
Dr. Jurin has obferved in 
the 
Thil. 
Tranf 
N«. 369. that the fubftance of 
all 
wood 
is fpe- 
cificallv heavier than water, fo as 
to fink in it, alter 
the ait is extracted from the pores and air-veflels of 
the wood, by placing it in warm water under the 
receiver of an air-pump 5 or if an air-pump cannot 
be had, by letting the wood continue fomc time 
in boiling water over a fire. The feveral weights 
therefore above given mull be looked upon as the 
weights of the concrete bodies, in the condition 
they were, before the Air was either forcibly got 
out, or the water driven into the fmall hollows : 
and both thefe confiderations may have their ufe 
P p p as 
