CONTENTS 
OF VOL. 152. 
I. On the Influence of Temperature on the Electric Conducting Power of Metals. By 
Augustus Matthiessen, F.B.S., and Moritz von Bose page 1 
II. On the Aguiferous and Oviducal System in the Lamellih'anchiate MollusJcs. By 
George Kolleston, Esq., M.B., F.L.8., lAnacre Professor of Anatomy ; and 
C. Eobertson, Esq., Demonstrator of Anatomy, Oxford. Communicated hy 
Dr. Acland 29 
III. On the Contact of Curves. William Spottiswoode, if. A., ... 41 
IV. On Lanxinic Acid, a a'ystallizahle volatile principle found in the Bark of the 
Larch Tree (Pinus Larix, Linn.). By Dr. John Stenhouse, F.R.S. ... 53 
V. On the Absorption and Radiation of Heat hy Gaseous Matter. — Second Memoir. By 
John Tyndall, F.B.S., Member of the Academies and Societies of Holland, Geneva, 
Gottingen, Zurich, Halle, Marburg, Breslau, JJpsala, la Societe Pliilomathique of 
Paris, &c.; Professor of Natural Philosophy in the Boyal Institution . . 59 
VI. On the Calculus of Symbols. William Spottiswoode, if.X, fl.S.iS'. . . 99 
VII. On the Theory of the Polyedra. By the Bev. Thomas P. Kirkman, if.^., F.R.S. , 
Honorary Member of the Literary and Philosophical Societies of Manchester and 
Liverpool 121 
VIII. On a New Series of Organic Compounds containing Boron. By Dr. E. Frankland, 
F.R.S. 167 
IX. On the Posterior Lobes of the Cerebrum of the Quadrumana. By William Henry 
Flower, F.R.C.S., Assistant-Surgeon to, and Demonstrator of Anatomy at, the 
Middlesex Hospital. Communicated by Dr. Sharpey, Sec. R.S 185 
X. On Magnetic Calms and Fjarth-Currents. By Charles V. Walker, Esq., F.R.S., 
F.R.A.S 203 
