The following are instances of the advantage of studying order of mixing:

When A is mixed in the above order (or any other in which proof spirit per se is used), the lotion is milky; but take rectified spirit 3x., add it to the liquor, then the glycerin, and lastly add water 3vj., and a clear lotion is obtained. In the case of B, place the ammoniated mercury in a mortar with about 15 grains of powdered tragacanth, add enough of the liquor to wet them well, rub smooth, add the lanoline (using anhydrous), and triturate till well mixed; then add gradually, with continued trituration, the remainder of the liquor. Some of the spirit of the liquor will meantime have been driven off. To replace this and swell the tragacanth add about 20 minims of water, which has also the effect of whitening the ointment.- Result: excellent.

Liquor Hydrogenii Peroxidi gives a white precipitate of calcium peroxide when dispensed with lime-water.