This day, price 30*., Vol. XXIV. Part III. of the 

 TRANSACTIONS OF THE ROYAL SOCIETY OF EDINBURGH 

 FOR THE SESSION 1866-67. 

 Contents. 



I. On the Colours of the Soap-bubble. By Sir David Brewster, K.H., F.R.S. 

 (With a Plate.) 



II. On the Figures of Equilibrium in Liquid Films. By the same. (With Three 

 Plates.) 



III. On the Third Coordinate Branch of the Higher Calculus. By Edward 

 Sang, Esq. 



IV. On Functions with Recurring Derivatives. By Edward Sang, Esq. 



V. On the Application of the Principle of Relative, or Proportional, Equality to 

 International Organization. By Professor Lorimer. 



VI. Some Mathematical Researches. By H. Fox Talbot, Esq. 



VII. On Centres, Faisceaux, and Envelopes of Homology. By the Rev. Hugh 

 Martin, M.A., Member of the Mathematical Society of London, and Examiner 

 in Mathematics in the University of Edinburgh. Communicated by Professor 

 Kelland. 



VIII. On the Arctic Shell-clay of Elie and Errol, viewed in connexion with our 

 other Glacial and more recent Deposits. By the Rev. Thomas Brown, F.R.S. E. 

 (With a Plate.) 



IX. Description of a double Holophote Apparatus for Lighthouses, and of a 

 Method of Introducing the Electric or other Lights. By Sir David Brewster, 

 K.H., D.C.L., F.R.S. (With a Plate.) 



X. On a Lower Limit to the Power exerted in the Function of Parturition. By 

 J. Matthews Duncan, M.D. &c. 



XL On the Motions and Colours upon Films of Alcohol and Volatile Oils and 

 other Fluids. By Sir David Brewster, K.H., F.R.S. (With a Plate.) 



XII. On the Sophists of the Fifth Century, b.c. By Professor Blackie. 



XIII. On the Diurnal Variation of the Magnetic Declination at Trevandrum, 

 near the Magnetic Equator, and in both Hemispheres. By John Allan Broun, 

 Esq., F.R.S., late Director of the Observatory of His Highness the Maharajah 

 of Travancore, G.C.S.L, at Trevandrum. (With Five Plates.) 



XIV. On an Application of Mathematics to Chemistry. By Alexander Crum 

 Brown, M.D., D.Sc. 



XV. Description of Pygopterus Greenockii (Agassiz), with Notes on the Struc- 

 tural Relations of the Genera Pygopterus, Amblypterus, and Eurynotus. By 

 Ramsay H. Traquair, M.D., Demonstrator of Anatomy in the University of 

 Edinburgh. Communicated by William Turner, M.B. (With a Plate.) 



XVI. On the Physiological Action of the Calabar Bean {Physostigma venenosum, 

 Balf.). By Thomas R. Fraser, M.D., Assistant to the Professor of Materia 

 Medica in the University of Edinburgh. Communicated by Professor Christi- 

 son, M.D., D.C.L., V.P.R.S.E. 



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



Thirteen Quarto Plates, price 5s. 



THE CONSTELLATION-SEASONS. 



By R. A. PROCTOR, B.A., F.R.A.S., 



Author of ' Saturn and its System/ &c. 



" The merest child can find the proper chart for any hour and compare with 

 the face of the heavens. This is a great advantage." — Athenceum. 



By the same Author, now ready, 

 SUN VIEWS of the EARTH ; or, the Seasons Illustrated. 14 Quarto 

 Plates, price 6s. coloured. 



TWO CHARTS of the SOLAR SYSTEM, presenting on an exact scale 

 (for the first time) the Orbits, Motions, &c. of (1) the Four Minor, (2) the Four 

 Major Planets. 6d. each. 



CHART of the ZODIAC, useful for tracing in the paths of the Moon and 

 Planets from the places given in the Almanacs, &c. Price Is. coloured. 



CHART of MARS (from 27 Drawings by Mr. Da was), with 18 Views of the 

 Planet. Price Is. coloured. 



" Mr. Proctor writes from love of his subject, and his works are sound and 

 useful." — Athenceum. 



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



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