solution. It is applied to the skin and when the ether or alcohol has eva- 

 porated it leaves a thin film upon the surface. 



Confectio, (Confection, e.g. Confectio Sennse) A soft sticky mixture 

 of sugar or syrup with some active drug. These preparations are very 

 little used at the present day. 



Decoctum, (Decoction, e.g. Decoctum Haematoxyli) There are only 

 three official decoctions and it is rarely that they are used . 



Emplastrum, (Plaster, e.g., Emplastrum Plumbi) A preparation 

 composed of some active drug incorporated with an adhesive and per- 

 manent base such as lead oleate, soap, or resin, and of such consistence 

 that they can be spread upon linen, muslin, or leather and will remain 

 adherent if applied to the skin. 



Extractum, (Extract) An extract which has been evaporated to a 

 solid or semi-solid consistence. If the extract has been made with water 

 it is known as an Aqueous Extract, if with alcohol, as an Alcoholic Extract. 

 As in proportion to their bulk they contain 2-6 times as much of the active 

 constituents as the crude drug, they have a much smaller dose and are of 

 especial value in the preparation of pills. 



Extractum Liquidum, (Liquid or Fluid Extract, e.g., Extractum 

 Filicis Liquidum.) A concentrated extract of such strength that each fluid 

 ounce of the product of the extract represents the active principles of an 

 ounce by weight of the drug. They may be made with alcohol, water, or 

 ether. They are very convenient preparations for incorporating in a 

 mixture, but as they may contain substances which are soluble in the sol- 

 vent with which they are made, but not soluble in other solvents they may 

 give rise, if mixed with other solvents, to precipitates of inactive ingredients 

 which may be filtered off. 



Extractum Viride, (Green Extract, e.g. Extractum Hyoscyami Viride) 

 These are the partially or completely dried juices of plants obtained by 

 expression. As they contain the active constituents in a concentrated 

 form and are usually adhesive, especially if a little water is added, they 

 may frequently be used for the preparation of pills. 



Glycerinum, (Glycerin, e.g. Glycerinum Tragacanthae).^A solution of 

 a drug in glycerin. They are useful on account of the special solvent or 

 preservative properties of glycerin. 



Infusum, (Infusion, e.g. Infusum Digitalis) an extract prepared by 

 infusion. 



Injectio Hypodermica, (Hypodermic Injection, e.g. Injectio Morphinae 

 Hypodermica) A solution of a potent drug in water. They are adminis- 

 tered by means of a syringe underneath the skin. Great care must be 

 taken that they are sterile. This is obtained by boiling or by care in pre- 

 paration or by the addition of an antiseptic. 



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