CONTENTS. 
PART I. 
I. Contributions to the Developmental History of the Mollusca. By E. Ray Lankester, 
M.A., Fellow of Fxeter College , Oxford. Communicated by George Rolleston, 
F.B.S. , Linacre Professor of Physiology page 1 
II. Besearches on Explosives. — Fired Gunpowder. By Captain Noble ( late B.A.), 
F.B.S . , F.B.A.S., F.C.S., &c., and F. A. Abel, F.B.S. , President C.S., &c. 49 
III. On the Atmospheric Lines of the Solar Spectrum, illustrated by a Map drawn on 
the same scale as that adopted by Kirchhoff. By J. B. N. Hennessey, F.B.A.S. 
Communicated by Professor Stokes, Sec. B.S 157 
IV. Contributions to Terrestrial Magnetism. — No. XIV. By General Sir Edward 
Sabine, B.A., K.C.B . , F.B.S 161 
V. Addition to the Paper on “ Volcanic Energy: an attempt to develop its true Origin and 
Cosmical Belations.” By Robert Mallet, AM., C.E., F.B.S., M.B.I.A. 205 
VI. Besearch on the Smallpox of Sheep. By E. Klein, M.D., Assistant Professor at the 
Laboratory of the Brown Institution, London. Communicated by John Simon, 
F.B.S., D.C.L., Medical Officer of the Privy Council and of the Local Government 
Board 215 
VII. Description of the Living and Extinct Paces of Gigantic Land-Tortoises . — 
Parts I. & II. Introduction , and the Tortoises of the Galapagos Islands. By 
Dr. Albert Gunther, F.B.S., V.P.Z.S., Keeper of the Zoological Department of 
the British Museum 251 
VIII. On the Development of the Teeth of the Newt, Frog, Slowworm, and Green Lizard. 
By Charles S. Tomes, M.A. Communicated by John Tomes, F.B.S. . . 285 
IX. On the Structure and Development of the Teeth of Ophidia. By Charles S. Tomes, 
M.A. Communicated by John Tomes, F.B.S 297 
X. On Polishing the Specula of Beflecting Telescopes. By W. Lassell, F.B.S., 
V.P.B.A.S., LL.D 303 
