CONTENTS OF VOL. XXXVII. — THIRD SERIES. Vll 



Page 

 Mr. W. Ferguson's Notice of the occurrence of Chalk Flints and 



Greensand Fossils in Aberdeenshire 430 



Mr. J. J. Sylvester on a Porismatic Property of two Conies 



having with one another a contact of the Third Order .... 438 

 Mr. J . J. Sylvester on the Rotation of a Rigid Body about a 



Fixed Point 440 



Prof. Chapman on the Identity of Breislakite and Augite .... 444 

 Prof. Chapman's Note on the employment of Right Rhomboidal 



Prisms in Crystallography 446 



Mr. G. Walker on the Theory of a new species of Locomotive 



Vessel that will diminish the ordinary resistance of the Water 



to one-fortieth part of its retarding power in Vessels of the 



same burthen. (With a Plate.) 447 



Mr. E. Wilde on the Untenableness of the received Theory of 



Newton's Rings ..,-.... 451 



Mr. R. Ellis's Note to a former paper " On an alleged proof of 



the ' Method of Least Squares.' " 462 



Mr. G. Kirchhoff on a Deduction of Ohm's Laws, in connexion 



with the Theory of Electro -statics 463 



Proceedings of the Cambridge Philosophical Society 468 



The first idea of the Electric Telegraph 470 



On the Sulphuric and Nitric Compounds of Benzin and Naph- 



thalin, by M. A. Laurent 471 



On the Distillation of Mercury by High Pressure Steam, by M. 



Violette 472 



On the presence of Succinic Acid in the Human Body, by M. 



W. Heintz 473 



On a new Compound of Sulphur, Chlorine and Oxygen, by M. 



E. Millon 474 



Preparation and Analysis of Codeia, by Dr. Anderson 475 



On Hypochlorous Acid and the Chlorides of Sulphur, by M. E. 



Millon 476 



On the Discoloration of Silver by boiled Eggs, by M. Gobley. . 477 



On a Test for Protein Compounds, by M. E. Millon 478 



Meteorological Observations for October 1850 479 



Table 480 



NUMBER CCLIIL— SUPPLEMENT TO VOL. XXXVII. 



Dr. Stenhouse on Aloine, the Crystalline Cathartic Principle of 

 Barbadoes Aloes 481 



Mr. J. Bryce on Striated and Polished Rocks and " Roches 

 Moutonnees " in the Lake District of Westmoreland. (With 

 a Plate.) , 486 



Mr. J. Cockle's Analysis of the Theory of Equations. Second 

 and Concluding Part. In a Letter to T. S. Davies, Esq. . . 493 



Mr. R. Phillips's Remarks on the Theory of Thunder-storms. . 510 



