BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE, 

 22 ALBEMARLE STREET, LONDON, W. 



The next ANNUAL GENERAL MEETING will be held at DUBLIN, 

 commencing on WEDNESDAY, August 14. 



President-Elect, 

 W. SPOTTISWOODE, Esq., LL.D., F.R.S., F.R.A.S., F.R.G.S. 



Notice to Contributors of Memoirs.- — Authors are reminded that, under an 

 arrangement dating from 1871, the acceptance of Memoirs, and the days on which 

 they are to be read, are now, as far as possible, determined by Organizing Commit- 

 tees for the several Sections before the beginning of the Meeting. It has therefore 

 become necessary, in order to give an opportunity to the Committees of doing 

 justice to the several Communications, that each Author should prepare an 

 Abstract of his Memoir, of a length suitable for insertion in the published Trans- 

 actions of the Association, and that he should send it, together with the original 

 Memoir, by book-post, on or before August 1, addressed thus: — "General 

 Secretaries, British Association, 22 Albemarle Street, London, W. For Section 



" If it should be inconvenient to the Author that his Paper should 



be read on any particular day, he is requested to send information thereof to the 

 Secretaries in a separate note. 



G. GRIFFITH, M.A., 



Assistant General Secretary, Harrow. 



Now ready, 8vo, cloth, 30s. 



PHOTOGRAPHED SPECTRA. 



One Hundred and Thirty-six Photographs of Metallic, Gaseous, and other 

 Spectra, printed by the Permanent Autotype Process ; with Introduction, De- 

 scription of Plates, and Index ; and with an extra Plate of the Solar Spectrum 

 (showing bright lines) compared with the Air-Spectrum. 



By J. RAND CAPRON, F.R.A.S. 



London : E. & F. N. Spon, 46 Charing Cross. 

 New York : 446 Broome Street. 



THE GEOLOGICAL RECORD. 



The First Volume of this yearly publication has been issued. It describes -or 

 notices works on Geology, Mineralogy, and Palseontology published during the 

 year 1874, and contains upwards of 400 pages. 



Copies can be had of Messrs. Taylor and Francis, Red Lion Court, Fleet Street, 

 London. Price 15s. 



The Second Volume, describing works published in 1875, is now published. 

 Price 10s. 6d. to Subscribers and 16s. after publication. 



Subscribers' names and remittances should be sent to the publishers, Messrs. 

 Taylor and Francis, Red Lion Court, Fleet Street, London, E.C. 



UNIVERSITY OF LONDON. 



Now ready, price 4s. (post-free, 4s. 7\d.). 

 THE CALENDAR FOR THE YEAR 1878. 



Containing the Regulations for each Examination, the Examination Papers set 

 during the past year, Lists of Graduates, and other information. 



Taylob and Francis, Publishers to the Universitv, 

 Red Lion Court, Fleet Street, E.C. 



[ADVERTISEMENTS continued on 3rd page of Cover. 



-4155'^ 



