Dec. 26, 1878] NATURE Ixiii 



THE TELEPHONE COMPANY, LIMITED^ 



36, COLEMAN STREET, LONDON, E.G. 

 SOLE PROPRIETORS OF BELL'S AND OTHER PATENTS. 



Telephones and all necessary Instruments Supplied for Domestic or Business PtupDses, on Sale or Rental. 



Estimates can be obtained for fitting up Telephonic Communication in Mines, Factories, Workshops, or Privat« 

 Dwellings ; also for Lines of Wire Communicating between Lighthouses and the Shore ; Shipping Offices and Vessels 

 in Port ; Noblemen's Mansions and their Lodges, Stables, or Gamekeepers' Residences, &c., &c. 



Agents Wanted. — A Liberal Discount allowed to the Trade. 



Proceedings will be taken against all Persons selling or using any Telephones, or otherwise infringing the 

 Company's Patents. 



Application for Price Lists or further information to be made to the Manager. 



NOW READY, VOL. II., in 8vo, price i8j. 



A TREATISE ON CHEIVIISTRY. 



By Professors ROSCOE and SCHORLEMMER, 



Of the Owens CoUege, Manchester. 



With numerous Illustrations. 



Vol. II. Metals, Part I. 8vo. \%s. (Vol. I. The Non-Metallic Elements. 21J.) 



MACMILLAN & CO., LONDON. 



JUST PUBLISHED. 



GEGENBAUR'S COMPARATIVE ANATOMY. 



A Translation by F. JEFFREY BELL, B.A. 



REVISED WITH PREFACE BY PROF. E. RAY LANKESTER, F.R.S. 



With numerous Illustrations. Medium 8vo. 21J. 



MACMILLAN & CO., LONDON. 



TUST PUBLISHED. 



COAL, ITS HISTORY AND ITS USES. 



By Professors GREEN, IkHALL, THORPE, RtJCKERj^and MARSHALL, 

 Of the Yorkshire College, Leeds. 

 With numerous Illustrations. 8vo. I2J. &/. 

 MACMILLAN & CO., LONDON. 



Lately published, 8vo, price y. 6</. 



ON THE PHOTO-CHEMISTRY OF THE RETINA 



and on 



VISUAL PURPLE. 



TRANSLATED FROM THE GERMAN OF 



DR. W. KUHNE, 



Prefesser ef Physiology in the University of Heidelberg. 

 EDITED, WITH NOTES, BY 



MICHAEL FOSTER, M.D., F.R.S., 



Felloui and Prelector, Trinity College, Cambridge. 

 , J- MACMILLAN & CO., LONDON. 



