CONTENTS 
OF VOL. 145. 
I. The Bakerian Lecture. — On the Nature of the Force hy which Bodies are repelled 
from the Poles of a Magnet ; to which is pr^xed, an Account of some Experi- 
ments on Molecular Influences. By John Tyndall, Ph.D., F.R.S., Memhre de 
la Sociitd Hollandaise des Sciences ; Foreign Member of the Physical Society of 
Berlin, and Professor of Natural Philosophy in the Royal Institution, page 1 
II. On the Attraction of the Himalaya Mountains, and of the elevated Regions beyond 
them, upon the Plumb-line in India. By the Venerable John Henry Pratt, 
M.A., Archdeacon of Calcutta. Communicated by the Rev. J. Challis, M.A., 
F.R.S. i^c 33 
III. On the Computation of the Effect of the Attraction of Mountain-masses, as dis- 
turbing the Apparent Astronomical Latitude of Stations in Geodetic Surveys. 
By G. B. Airy, Esq., Astronomer Royal 101 
IV. An Account of some recent Researches near Cairo, undertahen with the view of 
throwing light upon the Geological History of the Alluvial Land of Egypt . — 
Instituted by Leonard Horner, Esq., F.R.SS. L. E., F.G.S. . . . 105 
V. Observations on the Respiratory Movements of Insects. By the late William 
Frederick Barlow, F.R.C.S. Arranged and communicated by James Paget, 
F.R.S. 139 
VI. On the Structure of certain Limestone Nodules enclosed in seams of Bituminous 
Coal, with a Description of some Trigonocarpons contained in them. By 
Joseph Dalton Hooker, M.D., and Edward William Binney, Esq. . 149 
VII. On the Theory of Definite Integrals. By W. H. L. Russell, Esq., B.A. Com- 
municated by A. Cayley, Esq., F.R.S. 157 
VIII. On Circumstances modifying the Action of Chemical Affinity. By J. H. Glad- 
stone, Ph.D., F.R.S. 179 
