CONTENTS. VU 



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 (continued) 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 Povi^er of Heat 451 



Mr. HaUiwell'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 

 Heat and Light when transmitted through Glass 467 



Mr. Weaver 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 olEudialyte 477 



Mr. Grove on some Phsenomena 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 (continued) 510 



Dr. C. Schaf haeutl on the Combinations of Carbon with Silicon 

 and Iron, and other Metals, forming the different species of 

 Cast [ron. 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 



