ENGLISH TRANSLATION OF MENDELEEFF'S CHEMISTRY. 



THE PRINCIPLES OF CHEMISTRY 



D. MENDELEEFF, 



Professor of Chemistry in the University of St. Petersburg. 



TRANSLATED BY 



GEORGE KAMENSKY, A.R.S.M., of the Imperial Mint, St. Petersburg; 



AND EDITED BY 



A. J. GREENAWAY, F.I.C., Sub-Editor of the Journal of the 

 Chemical Society. 



With 97 Illustrations and Diagrams. 



Two Volumes, 8vo, Price 36s. 



London : LONGMANS, GREEN, & CO. 



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INDEX OF SPECTRA. 



REVISED EDITION, GREATLY ENLARGED. 



BY 



W. MAESHALL WATTS, D.Sc, 



With Introduction on the Method of Measuring and Mapping Spectra. 

 Indispensable to spectroscopic inquiry. 



" Dr. Watts is to be congratulated upon the completion of his great under- 

 taking. The book will be heartily welcomed by all who are engaged in spectro- 

 scopic work, and no recommendation of ours is needed."— Nature. 



Post free from ABEL HEY WOOD & SON, Manchester, on receipt of 

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THE OBSERVATORY, 



A MONTHLY EEYIEW OF ASTRONOMY. 



Edited by 



H. H. TURNER, M.A., B.Sc, F.R.A.S., 



AND 



A. A. COMMON, LL.D., F.R.S., Treas. R.A.S. 



THE COMPANION TO THE OBSERVATORY FOR 1892. 



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