Preparations
Trituration
The reduction of a solid body to powder by rubbing. This is effected on a small scale by means of a pestle and mortar; and on a large scale…
Washing
This is resorted to in chemistry for two widely different purposes. When a substance contains both soluble and insoluble matter, the…
To Prepare Decoctions
Decoctions are solutions of the properties of vegetables obtained by boiling, which is presumed to be a more effective method of extracting…
To Prepare Tinctures
Tinctures and sometimes of mineral substances, in spirituous liquids. The spirit most commonly employed is proof-spirit; sometimes…
Concentrated Infusions
These are now very generally met with in trade, and are made of 8 times the pharmacopœial strength. They are mostly prepared by employing 8…
Infusion
When the principles to be extracted are soluble in water, and at the same time but slightly volatile, boiling water is poured on the…
Maceration
When an infusion is made without the aid of heat it is termed If an infusion is required of dried leaves or flowers, they are first…
To Prepare Extracts
The process of obtaining an extract of a substance involves two distinct operations: First, the production of a solution of the soluble…