Just published, 1 vol. 8vo, cloth, price 12s., 

 A MATHEMATICAL TREATISE ON THE MOTION OF PROJECTILES, 



Founded chiefly on the results of Experiments made with the Author's 



Chronograph. 



By FRANCIS BASHFORTH, B.D., 



Professor of Applied Mathematics to the Advanced Class of Royal Artillery 



Officers, Woolwich, and late Fellow of St. John's College, Cambridge. 



London : Asher and Co., 13 Bedford Street, Covent Garden, W.C. 



Berlin : 11 Unter den Linden. 



NEW EDITION OF LLOYD'S WAVE-THEORY OF LIGHT. 



Now ready, in 8vo, price 10s. 6c?. cloth, 



ELEMENTARY TREATISE ON THE WAVE-THEORY OP LIGHT. 



By HUMPHREY LLOYD, D.D., D.C.L., 



Provost of Trinity College, Dublin, and formerly Professor of Natural Philosophy 



in the University. 



Third Edition, revised and enlarged. 



London : Longmans, Green, and Co., Paternoster Row. 



NEW WORK BY THE REV. DR. HAUGHTON, M.D. 



In 8vo, with 111 figures on Wood, price 21s. cloth, 



PRINCIPLES OF ANIMAL MECHANICS. 



By the Rev. SAMUEL HAUGHTON, F.R.S., 



Fellow of Trinity College, Dublin; M.D. Dublin and D.C.L. Oxon. 



London: Longmans, Green, and Co., Paternoster Row. 



TEXT-BOOKS OF SCIENCE, EDITED BY T. M. GOODEVE, M.A., 

 AND C. W. MERRIFIELD, F.R.S. 



Just published, in small 8vo, price 3s. 6d. cloth, 



ELECTRICITY AND MAGNETISM. 



By FLEEMING JENKIN, F.R.SS.L. & E., 



Professor of Engineering in the University of Edinburgh. 



Text-books previously published, price 3s. 6d. each : — 

 GOODEVE'S MECHANISM. 

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 MILLER'S INORGANIC CHEMISTRY. 

 GRIFFIN'S ALGEBRA AND TRIGONOMETRY. 

 NOTES ON THE SAME, WITH SOLUTIONS. 

 WATSON'S PLANE AND SOLID GEOMETRY. 

 MAXWELL'S THEORY OF HEAT. 

 MERRIFIELD'S TECHNICAL ARITHMETIC. 

 HUNTER'S KEY TO MERRIFIELD'S ARITHMETIC. 

 ANDERSON'S STRENGTH OF MATERIALS. 

 London : Longmans, Green, and Co., Paternoster Row. 



This day, price 12s., Vol. XXVI. Part IV. of the 



TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH, 



FOR THE SESSION 1871-72. 



Contents. 



I. On the Decomposition of Forces externally applied to an Elastic Solid. By 

 W. J. Macquorn Rankine, C.E., LL.D., F.R.SS.L. & E. 



II. On the Geometrical Mean Distance of Two Figures on a Plane. By Pro- 

 fessor J. Clerk Maxwell, F.R.S. 



III. On the Lunar Diurnal Variation of Magnetic Declination at Trevandrum, 

 near the Magnetic Equator, deduced from observations made in the Observatory 

 of His Highness the Maharajah of Travancore, G.C.S.I. By J. A. Broun, F.R.S. 



IV. On the Occurrence of Ziphius cavirostris in the Shetland Seas, and a com- 

 parison of its Skull with that of Sowerby's Whale (Mesoplodon Sowerbyi). By 

 Professor Turner. 



V. Remarks on the Ipecacuan Plant (Cephaelis Ipecacuanha, Rich.), as culti- 

 vated in the Royal Botanic Garden, Edinburgh. By John Hutton Balfour, 

 M.D., F.R.S., Sec. R.S.E., F.L.S., Hon. Mem. Pharm. Soc, and Professor of 

 Medicine and Botany in the University of Edinburgh. 



Edinburgh: R. Grant and Son. London : Williams and Norgate. 



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