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Proofof French Silk.-The French have adopt
ed system Of security against fraud in the sale
Of silks, by submitting it to examination and ex-
pertinent in an establishment called the condition.
Silk exposed to humid atmosphere, and yet
more to wet, will imbibe considerable quantity
Of humidity without undergoing any perceptibe
change in external appearance. This establish
ment, of which there is one at Lyons and another
at ST. Etienne, receives about three-fourths Of the
whole consumption of silk. II is submitted during
twenty -four hours to a temperature of from Ia 10
90 degrees Of Reaumur (72a to II Of FahrenheD,
and if the diminished weight be from % to per
cent, the application Of the high temperature is
continued during another twenty-four hours. On
certificate granted by the condition as to its true
weight, the invoice is made out. The means of
correctly ascertanng the real humidity Of silk are
now the subject of investigation at Lyons, and it
is believed that the purity of the material will,
long, be as accurately tested is that Of metals
Iby an assay. The quality of silk is estimated hv
deniers, which represent the weight Of 400 els


wound off on cylinder; the number, Of course,
increases with the fineness. The Alas silk is
sometimes reeled from three to four cocoons, and


weighs only from eightto ten deniers; sometimes
from seven to eight cocoons, which VIII give
eighteen to twenty deniers. OF French organ


zines, the quality varies principally from twenty


~ ,birtvs;x deniers and of French trans from


twenty.six to sixty deniers.-Dr. Boacring's


Report.