110 Correspondence of J. Nickleés. 
the point of ebullition in which is below this temperature. He has even 
succeeded with alcohol, whose point of ebullition is above 70° 
vents which succeed best are ether and sulphuret of carbon. 
The devine are put into the apparatus, and the ether then pour 
so as to cover it. In 10 or 15 minutes the liquid is run off and a new 
long as the first. The ether dissolves all the perfume and deposits it 
again on distillation in the form of a variously colored ‘residue, some- 
times solid, sometimes oily or semi-fluid yet becoming solid after some 
time. This residue, when obtained in a thin layer, is fused by the solar 
heat or an equivalent temperature, and resoftened frequently until it 
exhales no longer the odor of the solvent. 
The solvent, ether or —— of carbon, should have been previously 
purified with the greatest care. That derived from the distillation may 
be used PNA priesded it is for the same flower and apparatus. 
e! naged there is but very little loss of the solvent and the 
pee is Sc rformed, much —. rapidly and with a larger 
and flowers than n by ordinary method of distilla- 
tion. e 2 pathihip of the dhowebsis should be done at the proper 
time of day for each flower. us the Oartation gives off its perfume 
after an exposure of two or three hours to the sun. Roses, on the con- 
hevint are mixed in nd the essence, ‘which co oer to! 
one of them, the better portion partly correcting the Bu 
the Millon process, the slightest alteration is apparent in the perfume, 
necessary to have them fresh and hi peach of the flowers 
determines the perfection of the perfu 
t first, — operated by pacing ar ties contact of the air. But 
now he favors its presence, for he has found that the perfume, secant of 
mea a ‘api like the essences, has great fixedness, It is 
act with other principles of the plant that it hn 
Ni, lng tae isolated it is beyond their influence and experiences 
no further change. Millon thus for several years has _kept ret: 
the aromatic aba from them. Alcohol ye ete ae for this pur- 
pose. It does not dissolve the waxy part, while it removes completely 
the odor. Ope with alcohol on a grain of the residue, the per 
fume is taken up with a little oil and the ewe matter, and the aro 
matin resin will haee:laeh.in Se petommonly-s & ew hundredths of its 
