376 Evaporation of Sprriis. 
The voice of the sick person can no longer be heard by 
the ear at liberty, the whole of the sound passing along the 
aperture of the cylinder to the observer. Commissioners 
appointed by the French Academy, have verified the exper- 
iment in various cases of consumption. 
21. Languages. 
M. Frederick Aldeling counsellor of state to the emperor 
of Russia, has lately published in one hundred and fifty 
hree pages. “A view of all the known languages and 
their dialects.” : 
In this view, we find in all 937 Asiatic, 587 European, 
276 African, and 1264 American languages and dialects 
enumerated and classed, a total of 3064. 
22. Evaporation of Spirits. 
The rapidity of evaporation and the cold produced by it 
have been applied by Mr. Ritchie of Perth, to the deter- 
“Having made three very delicate hydrometers, according 
to Leslie’s construction, I inserted the bulb of one of them 
with strong whiskey, the bulb of another with a mixture of 
equal quantities of the same spirits and water, and the bulb 
of the third with water. I watched the descent of the fluids 
in the stem till each had gained its maximum of cold and 
marked the cold induced by the water 40, by the diluted 
spirits 64, and by the strong spirits 88. Now the difference 
40 and 64 is 24, and between 40 and 88 is 48. Hence the 
“following proportion 24:48:: the strength of the dilute 
to the strength of the strong spirits. 
This I have tried with different proportions of spirits and 
water, in different states of the atmosphere, and found the 
same property uniformly obtain. The experiment requires 
to be performed with great delicacy and care, as the spirits 
soon acquire their maximum, after which the fluid in the 
tube begins to ascend—An. of Phil, 
8A 
its. 
newly discovered flower of extraordin ary dimensions. 
- Mr. Brown read before the Linnean Society of London @ 
moir on a new species of plants, discovered in Sumatr? 
