14 



je(^, }et their writings fliew. Without a knowledge 

 of chemiftry, drugs may be mixed fo as to produce 

 a third fubftance wholly different from their feparate 

 qualities, and which, in faft, may prove poifonous. 

 This is by no means unfrequent ; and yet many of 

 ihefe compounders jumble, without any judgment, 

 a vafl variety of articles into one mixture. With 

 regard to the compounded medicines which I here 

 offer, I can fay of them, that they have been chemi* 

 cally confidercd in every point of view ; and the re- 

 cipes from which they are formed are the refult of 

 long experience and frequent experiment; moil ac- 

 curately compounded, fo as to be always of one de- 

 terminate ftrength. They are made from the very 

 belt drugs, without any eye to the expenfe : and, 

 that 1 may always be enabled to compound them iii 

 the fame way, I have affixed a price that will allow 

 of the purchafe of the beft drugs ; yet as thefe medi- 

 cines are prepared in large quantities at a time, fo 

 the price, fet on each is fuch, that no individual 

 recipe could be made up for the fame price, of good 

 drugs, and in juft proportions. They are likewife 

 fo compounded as to preferve good almoll any length 

 of time, and under every variety of temperature; 

 and which is a circumllance too feldom confidercd 

 in the making up of medicines. The form I have 

 alfo endeavoured to make as convenient as poffible : 

 they are likewife very portable. 



