than with the officinal plaster: but if immediately upon its 
application a piece of oiled silk is bound upon the part, and 
suffered to remain an hour, so as to prevent rapid desica- 
tion, a blister will be formed in three hours, sometimes even 
more quickly, and in one instance, in one hour. 
The medical gentlemen of this city who have used this 
preparation, speak in high terms of its satisfactory perform- 
ance, or, in the language of M. Hisch, " Repeated experi- 
ments by physicians with the cantharidal collodion have 
verified these statements." 
ART. III.— SUGGESTED FORMULA FOR UNGUENTUM TABACI. 
I have for a number of years prepared the Unguentum 
Tabaci exclusively by a private recipe, (the physicians 
precribing it being of course advised of its character,) and 
the ointment so prepared has been in great repute among 
my customers as a remedy for a "gathered breast." The 
success attending its use has induced persons removing 
from my vicinity to speak of it, so that I have repeatedly 
received orders for it from places hundreds of miles distant. 
I subjoin my formula, which I offer to the notice of the 
Committee on the Pharmacopoeia. 
Take of Tobacco leaves, (sliced) - - ^x. * 
Boil the tobacco in the vinegar to one pint — strain — reduce 
in a water bath to f.gvj., and add this fluid extract to the 
melted ointment, stirring constantly till it is cool. 
* T have employed pure cider vinegar of my own manufacture, 
which probably improves the consistence of the extract. The officinal 
dilute acetic acid would perhaps be better, as affording a uniform 
result. 
By William J. Alllnson. 
Cider vinegar,* 
Basilicon ointment, - 
Oiv. 
gxiij. 
