VESICATING TAFFETAS. 
203 
ed linen, taking care to let each one dry, before applying 
another; then — 
Balsam tolu, 1 part. 
Powdered cantharides, 2 parts, 
Sulphuric ether, 8 parts. 
Of this tincture apply ten successive layers, upon the layers 
of euphorbium. 
To insure the effect of these taffetas, moisten them with a 
small quantity of alcohol before application. 
Lastly, Gentlemen, I would remind you that Messrs. Hen- 
ry & Guibourt have published a formula, which consists in 
liquifying with double its weight of wax, the green oil that is 
obtained from cantharides by means of ether; the mixture is 
spread upon a sheet of waxed linen in the same manner as 
common adhesive plaster. 
We can have no motive for giving the preference to either 
of the preceding formulas. We have sought to decide by ex- 
periments the relative value of these different vesicating taf- 
fetas. 
M. Andral has been very willing to undertake these expe- 
riments. 
We present the table resulting from the observations upon 
this subject gathered by M. Fournet, his resident assistant. 
No. 1 is the taffetas according to M. Deschamps' formula; 
No. 2 is that of M. Thierry; the No. 3 according to formula 
of Henry & Guibourt. 
