CONTENTS. Vil 



Page 



Prof. J . J. Sylvester's Memoir on Rational Derivation from 

 Equations of Co-existence, that is to say, a new and extended 



Theory of Elimination 428 



Sir D. Brewster's Observations on Professor Plateau's Defence 



of his Theory of accidental Colours 435 



li. M. Z.'s Observations on Shooting Stars on the Nights of 



the 10th and nth of August, 1839 441 



Mr. C. W. Hamilton on the Stratified Rocks in the Neighbour- 

 hood of Killarney and Dublin 442 



Mr. Halliwell on the Connexion between the Boetian and the 



Middle- Arabic numerical Forms 447 



Mr. J. Tovey's Researches on the Undulatory Theory of Light 



continued : On the Absorption of Light 450 



Mr. W. Stark's Observations on Mr. Lyell's Paper, entitled, 

 " On the tubular Cavities filled with Gravel and Sand, called 



Sand-pipes, in the Chalk near Norwich" 455 



Prof. W. H. Miller on the Appearance of a Luminous Point 

 seen through a telescope, the object-glass of which has an 



aperture of the form of a scalene triangle 459 



Mr. W. S. Harris on Lightning Conductors, and on certain Prin- 

 ciples in Electrical Science, being an Investigation of Mr. 

 Sturgeon's Experimental and Theoretical Researches in Elec- 

 tricity, published in the Annals of Electricity 461 



New Books : — Mr. Lubbock's Remarks on the Classification of 



the Different Branches of Human Knowledge 473 



Proceedings of the' Cambridge Philosophical Society 476 



Royal Geological Society of Cornwall .... 477 



— Royal Society of Edinburgh 479 



Analysis of Caseum 482 



On Sulphate of Chloride of Sulphur, by H. Rose 483 



Arseniuretted and Subarseniuretted Chloride of Mercury .... 484 



Analysis of Albumen 485 



Analysis of Fibrin 486 



Notice from Dr. Robert Hare, Professor of Chemistry, &c., re- 

 specting the Fusion of Platina, also respecting a new ^ther, 

 and a Series of Gaseous Compounds formed with the Ele- 

 ments of Water 487 



Action of Ferrocyanide of Potassium on Chloride of Calcium, &c. 490 



Purpuric Acid 491 



Purpurate of Silver 492 



Purpurate of Potash 492 



Purpurate of Ammonia 492 



Purpurate of Barytes 493 



Action of Antimony on Bichloride of Mercury 494 



Blood Corpuscles in the Mammalia . . . . • , . 495 



Meteorological Observations for October, 1839 495 



Table 496 



