4 • VETBEHiTAET MATERIA MEDICA. 



to ointments, but firmer in consistence. They all 

 contain wax {cera). 



CoLLODiA, collodions, are liquid preparations 

 whose basis consists of guncotton dissolved in a mix- 

 ture of alcohol and ether. 



Decocta, decoctions, are aqueous preparations of 

 "vegetable drugs, made by boiling these in water for 

 from fifteen to thirty minutes, and then straining 

 through cloth or muslin. Usually ten per cent, 

 strong, unless otherwise ordered. 



Elixiria, elixirs, are aromatic sweetened prepara- 

 tions, containing active medicinal agents in small 

 quantity, and are made with a menstruum of alcohol 

 1 and water 3. They are intended as an excipient for 

 extracts, salts, etc., and are used mostly in canine 

 practice. 



Emplastra, plasters, are solid compounds, tena- 

 cious but pliable, and are prepared by incorporating 

 the medicinal agents with certain bases to form a 

 mass, which is to be evenly spread upon chamois 

 skin, muslin, kid, or ordinary adhesive plaster. They 

 are for external use only. 



Extracta, extracts, are solid or semi-solid prepar- 

 ations obtained by evaporating solutions of the soluble 

 parts of drugs. Alcohol and water are the most com- 

 mon solvents. 



Extracta Fluida, fluid extracts, are alcoholic 

 solutions or concentrated tinctures of vegetable drugs. 

 They are prepared by percolation with menstrua of 

 alcohol, diluted alcohol, or alcohol and water in va- 

 rious proportions; the resulting product being then 



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