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In view of the extremely diversified nature of the substances entering into the composition of medicines, the separation and determination of the several ingredients of a medicinal preparation is often a matter of great difficulty and is occasionally impossible. Since a glimpse into nearly every phase of chemical activity is necessary in order to cope successfully with all of the problems met with in drug analysis, a comprehensive work devoted to the subject is a much-sought desideratum. Because of the magnitude of the task no one has hitherto attempted the preparation of such a treatise, but the "Introduction to the Analysis of Drugs and Medicines" apparently is a step in this direction, although this work, as the title implies, is little more than an outline of the subject. At the outset of the book the term "drug" is limited by definition to "a dried plant part in the crude state."
Introduction to the Analysis of Drugs and Medicines. An Elementary Handbook for the Beginner.. JAMA. 1910;55(9):796. doi:10.1001/jama.1910.04330090070032