APPENDIX. ] MODIFIED by COMPRESSION. r8t 
Tue firft eleven are the fame with thofe ufed in the paper read 
in this Society on the 30th of Auguft 1804, and pubhfhed in 
NicuHotson’s Fournal for October following, and which refer 
to the fame fpecimens. No. 12. Is a fpecimen of yellow marble, 
bearing a ftrong refemblance to No. 3. No. 13. A fpecimen of 
chalk. . No. 14. Shews the average of three trials with chalk. 
No. 15. Some pounded chalk, rammed in the manner followed 
in thefe experiments. In order to afcertain its {pecific gravity, 
I rammed the powder into a glafs-tube, previoufly weighed ; 
then, after weighing the whole, I removed the chalk, and filled 
the fame tube with water. I thus afcertained, ina dire@ man- 
ner, the weight of the fubftance, as ftated in Column II., and 
that of an equal bulk of water, ftated in,Column VIII. 
Cotumn II. Weight of the fubftance, dry in air, after expo- 
fure, during feveral hours toa heat of 212° of FAHRENHEIT. 
Cotumn III. Its weight in water, after lying long in the li- 
quid, fo as to perform its full abfarption and all air-bubbles 
being carefully removed. 
Cotumn IV. Weight in air, wet. The loofe external moitt- 
ure being removed by the touch of a dry cloth; but no time 
being allowed for evaporation. 
_ Cotumn V. Difference between Columns II. and III., or ap- 
parent weight of water difplaced. 
Cotumn VI. Difference between Columns II. and IV., or the 
catia 
CoLtumn VIL. Abforption reduced to a “tee centage of the dry 
fubftance. 
Cotumn VIII. Sum of Columns V. and VI., or the real 
weight of water difplaced by the body. 
» CoLtumn IX. Specific gravity, by the common mode, refult- 
' ing from the divifion of Column II. by Column V. 
Cotumn X. Specific gravity, in the new mode, refulting 
from the divifion of Column II. by Column VIII. 
THE 
