vi CONTENTS OF VOL. XXXIII. — THIRD SERIES. 



NUMBER CCXXI II.— NOVEMBER. 



Iltge 



Mr. A. Claudet's Description of the Photographometer, an in- 

 strument for measuring the Intensity of the Chemical Action 

 of the Rays of Light on all the Photographic preparations, 

 and for comparing with each other the sensitiveness of these 



different preparations. (With a Plate.) . 329 



Prof. .1. R. Young on the Extension of the Theorem of Leib- 

 nitz to Integration 335 



Lieut.-Colonel Portlock on the absence of any Traces of the 

 fall of Aerolites and of Glacial Action in the Strata formed 

 before the last great modification of the Earth's surface. . . . 337 

 Mr. T. Dickson's Inquiry into the Amount of Inorganic Con- 

 stituents contained in Ale and Porter 341 



Mr. H. Taylor on the Apparent Motion of the Figures in cer- 

 tain Patterns of Blue and Red Worsted 345 



Mr. G. G. Stokes on a difficulty in the Theory of Sound .... 349 

 Mr. Richard Phillips on the Spontaneous Cohesion of the Par- 

 ticles of Alumina 357 



The Rev. J. Challis on the Vibrations of an Elastic Fluid .... 360 

 Mr. J. Glaisher's Remarks on the Weather during the Quarter 



ending Septemner 30, 1848 365 



The Rev. A. Weld's Account of the Aurora Borealis as seen at 



Stonyhurst Observatory, October 18, 1848 376 



Mr. B. C. Brodie on the Chemical Nature of a Wax from China 378 

 Notices respecting New Books: — The Phvsical Atlas. Parts VI. 



to X 392 



Proceedings of the Cambridge Philosophical Society 393 



On the Ripening of Fruits and the Gelatinous Bodies of Vege- 

 tables, by M. E. Fremy 394 



On Sulphomorphide and Sulphonarcotide, derivatives from Mor- 

 phia and Narcotina, by MM. Laurent and Gerhardt 396 



Composition of Uranite and Chalcolite, by M. Werther 397 



Society of the Friends of the Natural Sciences of Vienna: — Dr. 



Bialloblotzky's African Journey 398 



On the Distilled Waters of Cherry-Laurel and Bitter Almonds, 



by M. Lepage 399 



On Metallic Carbonates, by M. J. Lefort 401 



Meta-Antimoniate of Ammonia, by M. E. Fremy 402 



Gresham College 403 



Meteorological Observations for September 1848 407 



. Table 408 



NUMBER CCXXIV.— DECEMBER. 



MM. L. Svanberg and H. Struve on the Atomic Weight of 

 Molybdenum and some of its Compounds 409 



