196 
ORIGINAL COMMUNICATIONS. 
We have taken advantage of the concentrative power, offer- 
ed by displacement, to make some new syrups of great 
activity, which have been extensively used, and of which we 
subjoin a notice. 
First in order comes Rhatany, a substance upon which 
the Messrs. Boullay have made some interesting experi- 
ments, proving, in a most satisfactory manner, that the ex- 
tracts obtained by displacement are vastly superior to those 
made by the ordinary boiling process. 
Syrup of Rhatany. 
Take of 
Rhatany root in a bruised state, (mashed in a 
mill) or in coarse powder, . . .1 pound. 
Water, . . . . . . q. s. 
Refined Sugar, ...... 2 pounds. 
Mix with the root sufficient water to render the whole 
thoroughly moist; afterwards place it in a Boullay's filtering 
instrument, and operate by displacement with the remainder 
of the water, until you have obtaind thirty-two ounces. Then 
evaporate, in a water bath, to sixteen ounces, and add the 
sugar. Form a syrup, marking 31° B., boiling. 
This will make one quart of a beautiful and powerfully astrin- 
gent syrup, containing fourteen drachms of soluble extract, — of 
which each ounce will contain twenty-six grains. 
Syrup of Uva Ursi. 
Take of 
Uva Ursi 4 ounces- 
Water, . . . . . q. s. 
Refined Sugar, . ... 1 pound. 
First bruise the uva ursi, and add a sufficiency of the 
menstruum to render it thoroughly moist; then place it in a 
Boullay's filtering instrument, and operate, by displacement, 
until you have exhausted it of all its soluble active principles; 
this may be known by the last portions of water being nearly 
devoid of taste and color; then evaporate in a water bath to 
ten ounces, add the sugar, and form a syrup, marking 31° B. 
