Errata in December Number. 

 Page 461, lines 16-21, for P read P. 



Just published, in One Volume of more than a thousand pages, with Illustra- 

 tions and Diagrams, demy 8vo, £1 lis. Qd. 



EXPERIMENTAL RESEARCHES IN PURE, APPLIED, AND 

 PHYSICAL CHEMISTRY. 



By E. FRANKLAND, Ph.D., D.O.L., F.R.S., 



Professor of Chemistry in the Royal School of Mines, &c. 



The work includes investigations on the synthesis of organic compounds, the 

 manufacture and illuminating-power of gas, domestic water-supply, the purifi- 

 cation of sewage, the force-value of food, and on climate. 



I 

 John Van Voorst, 1 Paternoster Row. 



Recently published, 8vo, cloth, boards, price 10s. Qd. 



THE THEORY OP SCREWS: 



A STUDY IN THE DYNAMICS OF A RIGID BODY. 



By ROBERT STAWELL BALL, LL.D., F.R.S., 



Andrews Professor of Astronomy in the University of Dublin, and Royal 

 Astronomer of Ireland. 



Dublin : Hodges, Foster, and Co. London : Simpexn, Marshall, and Co. 



Price Sixpence, 



TAYLOR'S CALENDAR OF MEETINGS 



OP 



THE SCIENTIFIC BODIES OF LONDON 

 FOR 1877-78. 



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



THE GEOLOGICAL RECORD. 



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

 notices works on Geology, Mineralogy, and Palaeontology 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 Fifteen Shillings. 



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

 Price 10s. Qd. 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. 



[ADVERTISEMENTS continued on 3rd page of Cover. 



