ite Spanish ditto .5294
Apple tree .7930
Pear tree .6610
Quince tree .7050
Medlar .9440
Plumb tree .7850
Olive wood .9270
Cherry tree .7150
Filbert tree .6000
French box .9120
Dutch ditto 1.3280
Dutch yew .7880
Spanish ditto .8070
Spanish cypress .6440
American cedar .5608
Pomgranate tree 1.3540
Spanish mulberry tree .8970
Lignum vitae 1.3330
Orange tree .7050

_Note_--The numbers in the above Table, if the Decimal point be carried
three figures farther to the right hand, nearly express the absolute
weight of an English cube foot of each substance in averdupois ounces.
See No. VIII. of the Appendix.--E.

No. VIII. ADDITIONAL.

RULES _for Calculating the Absolute Gravity in English Troy Weight of a
Cubic Foot and Inch, English Measure, of any Substance whose Specific
Gravity is known[64]._

In 1696, Mr Everard, balance-maker to the Exchequer, weighed before the
Commissioners of the House of Commons 2145.6 cubical inches, by the
Exchequer standard foot, of distilled water, at the temperature of 55 deg.
of Fahrenheit, and found it to weigh 1131 oz. 14 dts. Troy, of the
Exchequer standard. The beam turned with 6 grs. when loaded with 30
pounds in each scale. Hence, supposing the pound averdupois to weigh
7000 grs. Troy, a cubic foot of water weighs 62-1/2 pounds averdupois,
or 1000 ounces averdupois, wanting 106 grains Troy. And hence, if the
specific gravity of water be called 1000, the proportional specific
gravities of all other bodies will nearly express the number of
averdupois ounces in a cubic foot. Or more accurately, supposing the
specific gravity of water expressed by 1. and of all other bodies in
proportional numbers, as the cubic foot of water weighs, at the above
temperature, exactly 437489.4 grains Troy, and the cubic inch of water
253.175 grains, the absolute weight of a cubical foot or inch of any
body in Troy grains may be found by multiplying their specific gravity
by either of the above numbers respectively.

By Everard's experiment, and the proportions of the English and French
foot, as established by the Royal Society and French Academy of
Sciences, the following numbers are ascertained.

P