- 
42. Observations upon some sulphur 
M. Dumas.—It is po that ar yatet ‘dice, 
er, the higher the temperature is raised, that just before boil. 
ing, it becomes more fluid, and that its color constantly advan- 
ces to a reddish brown ; that, finally, being suddenly cooled, 
when it has cee oe et heated, os is of 
until the moment when it crysta The only remark 
which M. Danial appears ts eer is, ctlet it is not necessa- 
ry to keep the sulphur hot a long time, but only to raise it to 
the necessary temperature, and to cool it “i deny; by divi- 
bis § ae to restr 28 it toa soft state.—Ibz = frrite 
189 
= (entunciesiei by Dr. William Meade.) 
aS, Death of the Hon. George Knox.—We are concerned 
d 
quaintance, by whom he was sateen esteemed for his ma- 
ny amiable qualities. But by the friends of science in par- 
ticular, his premature decease will be severely felt; few 
gentlemen of his high rank, have , adievated the sciences of 
Chemistry and Mineralogy, in all their branches wi 
zeal and ardor than Mr. Knox. The Transactions of the 
Royal Society of as contain many of his on 
ysis of certain minerals, proving the existence of bitumen 
m several of those where it had not been previously suspect- 
, and pointing out, from this circumstance, the probable 
ause of those discordant results, which have appeared in 
the Analytical enquiries of different Chemists on the same 
substances. 
44. Portable Gas.—The lamps for portable gas are of 
all shapes and sizes; they are all of malleable iron, and, 
when placed in a room, are put into bronze or other cases, 
which combine the useful with the ornamental; the price is 
three farthings a cubic foot ; and, we should suppose that a 
lamp, containing twenty cubic feet, would give light equal 
to that of two candles for a week, and burn five or six hours 
