Intelligence and Miscellaneous Articles. 583 
native physician or nurse was ever known to contract the disease. 
This liability to a fatal form of fever should at least induce great 
caution in those who resort to hot climates ; and had the principle 
on which the mortality in those climates depends been fully under- 
stood, we might for many years perhaps have reaped advantages 
from the labours of Mr. Drummond in the cause of science. We 
owe to him many interesting plants; and like his fellow-labourer 
Mr. Douglas, his name must ever be honourably associated with 
the botany of North America.” 
His Grace the Duke of Somerset was re-elected President ; 
E. Forster, Esq., Treasurer; Francis Boott, M.D., Secretary; and 
Richard Taylor, Esq., Under-Secretary; and the following five 
gentlemen were elected into the Council, in the room of others 
going out, agreeably to the By-Laws: viz. William Borrer, Esq.; 
John Bostock, M.D.; John George Children, Esq.; Archibald 
Menzies, Esq.; Rev. Thomas Rackett, M.A. 
XCIV. Intelligence and Miscellaneous Articles. 
ON THE PROPERTIES OF LIQUID CARBONIC ACID. 
CCORDING to M. Thilorier, this liquefied gas presents the 
strange and paradoxical fact of a liquid more expansible than the 
gases themselves: from 32° to 86° Fahr., its volume increases from 
20 to 29, that is to say, that at 86° Fahr. the increase of volume is 
nearly equal to half the volume at 32° Fahr. Its expansion is four 
times greater than that of atmospheric air, which from 32° to 86° 
Fahr. only expands .3,°-, whilst the expansion of liquid carbonic acid 
on the same scale is 334. If the temperature of a tube containing a 
portion of liquid carbonic acid is raised, this liquid boils, and the 
empty space above the liquid is saturated with a greater or less 
quantity of vapour according to the elevation of the temperature. 
At 86° Fahr., the quantity of liquid at 32° Fahr. sufficient to saturate 
the empty space is represented by a portion of liquid equal to one 
third of the space in which the vaporisation has been effected. At 
32° Fahr. the portion of liquid of saturation is only », of the space 
saturated. 
The pressure of the vapour formed by the liquefied gas from 32° 
to 86° Fahr., amounts from 36 to 73 atmospheres, which is equivalent 
to an increase of one atmosphere for every centigradedegree. It is 
important to observe that the weight or the density of the vapour 
increases in a much greater proportion than the pressure, and that 
the law of Mariotte is no longer applicable within the limits of the 
liquefaction. If the density of the vapour is taken for the base of the 
pressure, the pressure at 86° Fahr. will be equal to 130 atmospheres, 
whilst the manoscope will only indicate 73 atmospheres. If a tube 
of glass containing a portion of liquid anda portion of gas be heated, 
two contrary effects will take place: 
Ist, the liquid will augment by expansion ; 
2nd, the liquid will diminish by vaporisation. 
The thermoscopic effects are very different according as the por- 
