INTRODUCTION TO THE RARER ELEMENTS - 1919 - PREFACE TO THE FOURTH EDITION - IN attempting to bring this work up to date for a new edition the author has made numerous changes and additions throughout. The chapter on Radio-Elements has been thoroughly revised by Professor B. B. Boltwood, who contributed it originally to the second edition. Professor H. S. Uhler, who aided in the selection of certain spectroscopic material for the third edition, has furnished a plate showing the spectrum of gallium and also the spectra of ...
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INTRODUCTION TO THE RARER ELEMENTS - 1919 - PREFACE TO THE FOURTH EDITION - IN attempting to bring this work up to date for a new edition the author has made numerous changes and additions throughout. The chapter on Radio-Elements has been thoroughly revised by Professor B. B. Boltwood, who contributed it originally to the second edition. Professor H. S. Uhler, who aided in the selection of certain spectroscopic material for the third edition, has furnished a plate showing the spectrum of gallium and also the spectra of certain gallium and indium products prepared in collaboration with the . author. To both of these colleagues the author acknowledges his indebtedness. The section dealing with the rare earths has been rearranged in accordance with recent researches in that field. The discovery of gallium, indium, and germanium in appreciable amounts in certain of our American commercial mineral products has furnished material for a wider study of these elements, and has made desirable a more extended description of their chemical behavior. The treatment of the subject of qualitative separation has been made fuller by the introduction of certain alternative methods and some of the newer technical applications of the rarer elements have been noted. A table has been prepared to show the chief associates of these elements, and so to indicate the major analytical problems which face the chemist interested in them. Special attention has been given to the revision of the experimental work, which now consists of about two hundred experiments. Included in these are adaptations, suitable for the laboratory, of processes by means of which compounds of practically all the rarer elements may beobtained from available minerals or from commercial by-products. A careful study of the experiments will accomplish the main purpose of the book. The author wishes to reiterate the statement made in former prefaces that this little work is intended not to treat exhaustively the subject of the rarer elements, but rather to serve as an introduction to the study of an interesting group which the chemist in the inorganic field cannot afford to neglect. XEIV HAVEX, C ONN. J, a nuary, 1917. - PREFACE TO FIRST EDITION - THIS small volume, prepared from material used by the author in a short lecture course given at Yale University, is intended to serve as a convenient handbook in the introductory study of the rarer elements that is, of those elements which are not always taken up in a general course in chemistry. No attempt has been made to treat any part of the subject exhaustively, but enough references have been given to furnish a point of departure for the student who wishes to investigate for himself. Experimental work has been included except in the case of those elements which are unavailable, either because of their scarcity or because of the difficulty of isolating them. The author has drawn freely upon chemical journals and standard general works. In his treatment of the rare earths he has made especial use of Herzfeld and Korns Chelnie der seltenen Erden and Truchots Les Terres Rares, works which he gladly recommends. He gratefully acknowledges the valuable assistance of his wife in preparing this ma terial for the press. NSW H vsn CONN., April, 1903. v TABLE OF CONTENTS . BVIE ZC I E V STIO SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. 235 MINERALS A SD REXGESTUS SED IN THE STUDY O F THE RARER IISCK...
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