Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . e finest and mostpowerful insect powder, worth nearly twice as much as that madefrom the half-closed or open flowers. It may be that the variation inquality of some of the commercial aconite is due to improper drying,or to the extraction of the active principles; still, there is no doubtbut that much of the trouble with this drug is due to the variation in GENERAL PRINCIPLES AND RULES XXV the time of collecti
Scientific and applied pharmacognosy intended for the use of students in pharmacy, as a hand book for pharmacists, and as a reference book for food and drug analysts and pharmacologists . e finest and mostpowerful insect powder, worth nearly twice as much as that madefrom the half-closed or open flowers. It may be that the variation inquality of some of the commercial aconite is due to improper drying,or to the extraction of the active principles; still, there is no doubtbut that much of the trouble with this drug is due to the variation in GENERAL PRINCIPLES AND RULES XXV the time of collection in different countries, as well as to its beingcollected from different species. Another factor affecting the quality of vegetable drugs iscarelessness in drying them and caring for them after they aregathered. At one time the Pharmacopoeia specified that somedrugs should be kept a certain length of time before being used, asin frangula andfcascara sagrada. In these instances the results of thechanges on keeping have been ascertained, and since a similar effectmay be obtained by heating the bark at 100° C. for forty-eight hours,this specification is deemed no longer Fig. 2.—A section of crude drug warehouse of Sharp & Dohme, Baltimore, IVfd. In some drugs a sort of ripening process takes place in the drying,as in gentian, guarana, vanilla and the solanaceous leaf drugs. Instill others a marked deterioration takes place if they are placed inheaps and allowed to ferment, as in the case of lavender and mostother drugs yielding essential oils. In the preparation of oil ofpeppermint, the yield of oil is greater and the quality better if theplants are allowed to dry and are distilled immediately or soon the other hand, the yield of methyl salicylate is greater in the leavesof Gaultheria procumbens or the bark of Betula lenta if they are firstmacerated in water for about twelve hours. Quite a number of drugs are not infrequently observed in com-merce in a mo
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Keywords: ., bookcentury1900, bookdecade1920, bookpublishernewyo, bookyear1920
