CONTENTS OF VOL. XXVI. - THIRD SEUIES. VU 



Page 



Formation and Composition of certain Metastannates 458 



On Digitalic Acid, by M. Pyrame Morin 459 



Preparation and Properties of certain Digitalates 460 



On Piauzite, a Mineral Resin, by M. Haidinger 462 



On Crystals in the Cavities of Topaz, by Sir D. Brewster .... 462 



'I'he late Professor Daniell 463 



Meteorological Observations for March 1845 463 



, Table 464 



NUMBER CLXXV.— JUNE. 



Dr. J. W. Draper on the Interference Spectrum, and the Ab- 

 sorption of the Tithonic Rays 465 



M. Biot on certain Points of Mathematical Optics 478 



Mr. Moon on the Symbols sin oo and cos oo , and on Fourier's 



Theorem 483 



Mr. W. SutcliiFe's Suggestions relative to the Theory of the 



Movement of Glaciers 495 



Dr. J. C. Prichard on the Crania of the Laplanders and Fin- 

 landers, with observations on the differences they present 



from other European races 497 



Dr. A. W. Hofmann on the Metamorphoses of Indigo. — Pro- 

 duction of Organic Bases which contain Chlorine and Bro- 

 mine (concluded) 502 



Mr. A. De Morgan on the almost total Disappearance of the 



earliest Trigonometrical Canon 517 



Capt. Newbold's Note on a recent Fossil Freshwater Deposit in 

 Southern India, with a few remarks on the Origin and Age 

 of the Kunker, and on the supposed decrease of Thermal 



Temperature in India 526 



Dr. G. Bird on certain Fallacies in Enderlin's Researches on 



the Constitution of the saline ingredients of Animal Fluids. . 532 

 Further Researches on Animal Electricity : Of the muscular 

 current and the proper current. (Extract from a letter from 



M. Matteucci to M. de Humboldt.) 534 



Dr. T. Thomson on Sillimanite 536 



Proceedings of the Royal Society 538 



Terrestrial Magnetism 539 



Cohesion of Liquids 541 



Meteorological Observations for April 1845 543 



Table 544 



