The slightest tendency of the mucilage to acidity will defeat the best manipulation. [The B.P. directs 100 grammes of gum acacia to be rinsed and dissolved in 150 millilitres of distilled water.-Ed.] No heat should be used to facilitate solution, for small picked gum acacia stirred occasionally in cold distilled water until the gum is dissolved gives an excellent result. Powdered gum is a very foolish expedient for gaining time, and, when this mucilage is not bright without filtration, alteration of an injurious character may be anticipated. When finished, mucilage should be strained through muslin and kept in a cool place.

Put the whole of the mucilage into the mortar first; add the almond oil by degrees, but rapidly, with constant circular stirring in one direction, from left to right. Never add a second drop of oil until the first quantity has been emulsified. This is known by the creamy character of the product and its tendency to form clear spaces by leaving the sides of the mortar. Study two things- quickness of motion and lightness of hand. To the emulsion add the syrup and the water rapidly; of the latter 1/2 ounce at a time. Five minutes should be employed in the whole operation. Slow dispensing is bad dispensing.

Powdered gum acacia is frequently ordered, and its exclusive use has been advocated by some continental pharmacists.

Misce.

Put the powdered gum into the mortar, and with a fair amount of force make it into a mucilage with 1 1/2 drachm of water. Proceed as in the last case, lightness of hand being essential when once the mucilage is made. Six minutes should complete the operation: an experienced dispenser will want less, but these remarks are written for beginners, and are not offered as advice to experienced pharmacists.