214 Dr. John Gorrie on the 
possible to decide as to the accuracy of his statement that the 
fibre is produced by a species of Cannabis, which he provisionally 
calls Cannabis sinensis. ‘This point cannot be determined with- 
out an examination of the flowers ;* and Dr. Macgowan does = 
appear to have seen them. But the description given by him é 
entirely that of the species of Baehmeria (formerly Urtien), cal 
ed B..nivea or tenacissima by botanists, or of a nearly allie 
cies; and I am not aware of any evidence to support the 8 
that the China grass-cloth (Chi Ma) is derived from a species of 
Cannabis. One of the other kinds mentioned by Dr. Macgowan, 
King Ma, was forwarded to Mr. Roxburgh, from Canton, by Mr. 
~~ Kerr, in 1812. 
een 
me 
ee 
hoe XX.—On the Quantity of Heat evolved from Atmospheric 
Air by Mechanical Compression ; by Joun Gorrie, M.D. 
(Concluded from p. 49.) 
wp 
“4 Tur pisivowios of the following tables is — sufficiently 
. ee . (clear to render their bi intelligible ; the first column represents 
". the date of the experiments, and the second the hours at which ob- 
S _. servations were ads and the duration of the experiment. ‘The 4 
ae hext three eolumns represent a series of observed temperatures: the 
Ls oe gives the temperature of the atmosphere ; the second shows 
, he temperature of the water used for absorbing the heat of the con- 
eS dese ir before i injection ; 3 the third shows. the temperature of the 
.: ter the process.of injection has enabled it to absorb 
oe yi ik the ale it-can take t ) from the condensed air; it also repre- 
- . sents the sensible temperature of the air after admixture with the 
2 eas of He Following these, are two columns; the first 
 . howing apparent. tension of: "ie air in the reservoir, in at- 
* “ost j e num 
i: oe 
oe £ wei revol Pi - gerd 
ye tee Ay 
é 
Jour. of Agr 
0 the 
