CONTENTS. 
Vll 
Page 
Mr. Lubbock on the Heat of Vapours, and on Astronomical 
Refractions. ^ 434 
M. Dumas’s Memoir on the Law of Substitutions, and the 
Theory of Chemical Types {cojitinued) 442 
Proceedings at the Royal Institution 447 
Meteorological Observations for March, 1840 447 
Table 448 
NUMBER CV.— JUNE. 
Mr. Brooke on crystallized Native Oxalate of Lime 449 
Dr. Draper on the Electro-motive Power of Heat 451 
Mr. Halli well’s Illustrations of the History of the Inductive 
Sciences. No. I. The Reception of the Copernican Theory 
in England 461 
Mr. Coathupe on certain Modifications of the Powers of 
Pleat and Light when transmitted through Glass 467 
Mr. V7eaver on the Mineral Structure of the South of Ire- 
land, with correlative matter on Devon and Cornwall, Bel- 
gium, the Eifel, &c. {concluded) 471 
Prof. Miller on the Form oiEudialyte 477 
Mr. Grove on some Phaenomena of the Voltaic disruptive 
Discharge 478 
Th. Scheerer on two Norwegian Cobalt Ores from the Skut- 
teruder Mine 482 
Prof. Poggendorff on Galvanic Circuits composed of two 
Fluids, and of two Metals not in contact 485 
Mr. G. Walker on the moving the Knight over every Square 
of the Chess-board alternately 498 
M. Dumas’s Memoir on the Law of Substitutions, and the 
Theory of Mechanical Types {continued) . . 501 
Prof. J. D. Forbes on an apparent Inversion of Perspective in 
viewing Objects with a Telescope 506 
Mr. Lubbock on the Heat of Vapours, and on Astronomical 
Refractions 510 
Dr. C. Schafhaeutl on the Combinations of Carbon with Silicon 
and Iron, and other Metals, forming the different species of 
Cast Iron, Steel, and Malleable Iron {continued) 514 
New Books : — Davies’s Solutions of the principal Questions of 
Dr. Hutton’s Course of Mathematics 524 
Proceedings of the Royal Society 526 
On the Production of Electrotypes, by A. Smee, Esq., Surgeon 530 
On the Reduction of Chromate of Lead, by R. F. Marchand. . 532 
Portraits in Daguerreotype 535 
Meteorological Observations for April, 1840 535 
Table 536 
