CONTENTS 
OF VOL. 15L 
I. Catalogue of Nebulae and Clusters of Stars. By Sir John Frederick William 
Herschel, Bart., F.B.S. page 1 
II. On the Spectra of some of the Chemical Elements. By William Huggins, Esq., 
F.B.A.S. Communicated by Dr. W. A. Miller, Treas. B.S. 139 
III. Account of Magnetic Observations made in the years 1858-61 inclusive, in British 
Columbia, Washington Territory , and Vancouver Island. By Captain It. W. Haig, 
B.A. Communicated by General Sabine, F.B.S 161 
IV. On the Influence of Temperature on the Electric Conducting-Power of Alloys. By 
Augustus Matthiessen, F.B.S., Lecturer on Chemistry in St. Marys Hospital, 
and Carl Vogt, Ph.D 167 
V. On the Absorption and Badiation of Heat by Gaseous and Liquid Matter. — Fourth 
Memoir. By John Tyndall, F.B.S., Member of the Academies and Societies of 
Holland, Geneva, Gottingen, Zurich, Halle, Marburg, Breslau, TIpsala, la Societe 
Philomathique of Paris, Cam. Phil. Soc. &c. ; Professor of Natural Philosophy in 
the Boyal Institution 201 
VI. A Comparison of the most notable Disturbances of the Magnetic Declination in 1858 
and 1859 at Kew and at Nertschinsk ; preceded by a brief Betrospective View of 
the Progress of the Investigation into the Laws and Causes of the Magnetic 
Disturbances. By Major-General Edward Sabine, B.A., President of the Boyal 
Society 227 
VII. Theoretical Considerations on the Conditions under which the [Drift) Deposits 
containing the Bemains of Extinct Mammalia and Flint Implements were 
accumulated, and on their Geological Age. By Joseph Prestwich, Esq., F.B.S., 
F.G.S. . 247 
