PREFACE

In venturing to add another book on Qualitative ChemicalAnalysis to the long list of publications on this subject, the authorhas been moved chiefly by the often expressed wish of studentsand friends to have his lectures on qualitative analysis renderedavailable for reference and for a wider circle of instruction.Parts I and II of the present book embody these lectures in theform to which they have developed in the course of the last sixteenyears, since, in 1894, the teaching of analytical chemistry,along the lines followed, was first suggested by Ostwald's pioneer"Wissenschaftliche Grundlagen der Analytischen Chemie."

The author believes that instruction in qualitative analysis,besides teaching analysis proper, should demand of the studenta very distinct advance in the study of general chemistry, andshould also, consciously, pave the way for work in quantitativeanalysis, if it is not, indeed, accompanied by work in that subject.The professional method of work, whether routine or researchwork of the academic or the industrial laboratory is involved,inevitably consists in first making an exhaustive study of thegeneral chemical aspects of the subject under examination: itincludes a thorough study of books of reference and of the originalliterature on the subject; and when the experimental work isfinally undertaken, it is carried out with a critical, searchingmind, which questions every observation made, every processused. The method of instruction in this book aims at developingthese habits of the professional, productive chemist. Forthe reasons given, a rather thorough and somewhat critical studyis first made (in Part I) of the fundamental general chemicalprinciple

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