64 



Oleorbsina Aspidii 

 Aspidium, recently reduced to No. 40 powder, 50.0 Gm. 

 Ether, a sufSeient quantity. 

 Place the aspidium in a cylindrical glass percolator provided 

 with a stop-cock, and arranged with a cover and a receptacle suit- 

 able for volatile liquids. Pack the powder firmly, and percolate 

 slowly with ether, added in successive portions, until the aspidium 

 is exhausted. Recovei* the greater part of the ether from the perco- 

 late by distillation on a water bath, and having transferred the resi- 

 , due to a dish, allow the remaining ether to evaporate spontaneously 

 in a warm place. Keep the oleoresin in well stoppered bottles. 



Note : The Oleoresin of Aspidium. usually deposits on standing, 

 a granular crystalline substance. This should be thoroughly mixed 

 with the fluid portion before use. 



ACETA— VINEGARS 



These are liquid preparations of the active principles of drugs, 

 prepared by extraction with Diluted Acetic Acid. They resemble 

 tinctures except for the solvent used. The Acetic Acid is a good 

 solvent for many of the active ingredients of plants and serves as a 

 preservative. It also produces soluble salts with the alkaloidal 

 principles of plants. But one is official. 

 Acetum Scillae, Vinegar of Squill 



This is prepared with Diluted Acetic Acid (6% by weight of 

 absolute Acetic Acid), and is made by maceration. It represents 

 10 per cent, of the active drug. 



AcETDM Scillae 



Squill, in No. 20 powder 5.0 Gm. 



Diluted Acetic Acid, a sufflcient quantity 



to make 50.0 mils 



Macerate the squill with 45 mils of diluted acetic acid during 

 seven days, with frequent agitation; then strain through muslin 

 and wash the mass on the strainer with enough diluted acetic acid 

 to make the strained liquid measure nearly 50 mils. Heat this 

 liquid to boiling, filter while hot, and when cold, add sufficient 

 diluted acetic acid to make the product measure fifty mils. 



