Now ready, No. I., with Photo-print of u Copernicus/' price Is, 



THE OBSERVATORY, 



A MONTHLY REVIEW OP ASTRONOMY. 

 Edited by W. H. M. CHRISTIE, M.A. 



Tayxor and Francis, Red Lion Court, Fleet Street, E.C. 



THE GEOLOGICAL RECORD. 



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Price 10s. 6d< 

 NEW WORK ON NAVIGATION BY SIR WILLIAM THOMSON. 



TABLES FOR FACILITATING SUMNER'S METHOD AT SEA. 



By SIR WILLIAM THOMSON, D.C.L., LL.D., F.R.S., 



Professor of Natural Philosophy in the University of Glasgow, and Fellow of 

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NEW WORK BY PROFESSOR EVERETT. 



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ILLUSTRATIONS 



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CENTIMETRE-GEAMME-SECOND SYSTEM OF UNITS. 



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