Now ready, Sixth Edition, much Enlarged, with 700 Engravings on Wood, 

 fcap. 8vo, cloth, 12*. 6d., 



THE ELEMENTS OF NATURAL PHILOSOPHY. 



By Charles Brooke, M.B., M.A., F.R.S. 



Based on the Work of the late Dr. Golding Bird. 

 John Churchill and Sons, New Burlington Street. 



BRITISH ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE. 



The next ANNUAL MEETING of the Association will be held under the 

 Presidency of His Grace the Duke of Buccleuch, K.B., F.R.S. &c, at Dun- 

 dee, commencing on Wednesday, September 4. 



Notices of Papers proposed to be read at the Meeting should be sent to the 

 Assistant General Secretary, G. Griffith, Esq., Harrow. 



Members and others who wish to obtain information about the Local arrange- 

 ments are requested to communicate with the Local Secretaries at Dundee. 



Just published, price Is., 

 A DYNAMICAL THEORY OF THE FIGURE OF THE EARTH; 



Proving the Poles to be elongated. 



By F. C. Bakewell, 



Author of ' Natural Evidence of a Future Life,' ' Manual of Electricity,' &c. &c. 



John Weale, Holborn. 



DETERMINATION OF ELECTRICAL RESISTANCE. 



A series of Original Articles on this subject by A. Matthiessen, F.R.S., and 

 C. Hockin, M.A., will shortly appear in The Laboratory. 



James Firth, 42 a Cannon Street, E.C. 



Price 6d. } 

 TEE LABORATORY, 

 A WEEKLY RECORD OF SCIENTIFIC RESEARCH. 



No. 13 (June 29). 



Full Report of Prof. Williamson's paper On Sir B. C. Brodie's Calculus of 

 Chemical Operations, read at the last Meeting of the Royal Society, and Dr. Od- 

 liug's remarks thereon. — Letter from Sir B. C. Brodiein reply to Mr. W. Stanley 

 Jevons. — On a Method of Determining Vapour-densities, by W. M. Watts, D.Sc. 

 — On Water Analysis, by Messrs. Wanklyn, Chapman, and Smith. — Meeting of 

 Chemical Society. — Paris Correspondence. — Review of Brooke's Elements of 

 Natural Philosophy. — Editorial Notes. — Paris Universal Exhibition. — Abstracts 

 of Foreign Papers, by H. Watts, F.R.S., and E. J. Mills, D.Sc, &c. 



„* # The following important original Communications have been published in 

 the Numbers for June : — 



On a New form of Voltaic Battery, by Father Secchi; On the Specific Gravity 

 of Liquids and of Bodies lighter than Water, by Dr. Matthiessen and Mr. Hockin; 

 On Alloys. — Determination of the Coefficients of Expansion, by the same ; On 

 Pugh's Determination of Nitric Acid, by Messrs. Chapman and Schenk ; On 

 Chlorophyll, by Mr. Tichborne. Correspondence On Sir B. C. Brodie's Symbols, 

 by Mr. Davey and Mr. W. S. Jevons. 



James Firth, 42 a Cannon Street, London, E.C. 

 Agents : Maclachlan and Stewart, Edinburgh ; Fannin and Co., Dublin. 



[ADVERTISEMENTS continued on 3rd page of Cover. 



