CONTENTS OF VOL. XXXIL 



(THIRD SERIES.) 



NUMBER CCXII.— JANUARY 1848. 



Page 

 Sir D. Brewster on the Optical Phsenomena, Nature, and Loca- 

 lity of MusccE volitantes ; with Observations on the Structure 

 of the Vitreous Humour, and on the Vision of Objects placed 

 within the Eye 1 



Prof. J. R. Young on the Integral / — , and on some conse- 

 quences that have been deduced from it 11 



Mr. H. M. Noad on the Action of Nitric Acid on Cymol 15 



Mr. C. Brooke's Account of the remarkable Magnetic Disturbance 

 which continued from the 22nd to the 25th of October 1847. 



(With a Plate.) 35 



Sir R. Kane's Note of the occurrence of a Deposit of native 



Earthy Carbonate of Manganese in Ireland 37 



Mr. W. R. Birt on the Great Symmetrical Barometric Wave, 



November 1847, and other important undulations 38 



Mr. J. Cockle on Algebraic Equations of the Fifth Degree .... 50 



Mr. H. Watts on the Analysis of Hop-Ash 54 



M. Plateau's Experimental Researches on Figures of Equilibrium 

 of a Liquid Mass withdraM'n from the Action of Gravity : 



Second Series 61 



Mr. F. A. Abel on some of the Products of Oxidation of Cumol 



by Nitric Acid 63 



Notices respecting New Books : — Recent Cambridge Works on 



Pure Mathematics 69 



Phosphate of Iron, Manganese and Soda, by M. A. Damour . . 74 

 Analysis of Columbite from the Environs of Limoges, by M. A. 



Damour , 74 



On the Acids of Sulphur, by MM. Fordos and Gelis 75 



On some Properties of Carbon, by M. Lazowski 76 



Detection of free Sulphuric Acid added to Wines 77 



On the Com]50sition of Urano-Tantalite and Columbite 77 



On the Fossil Vegetation of Anthracite Coal 78 



Meteorological Observations for November 1847 79 



Meteorological Observations made by Mr. Thompson at the 

 Garden of the Horticultural Society at Chiswick, near 

 London ; by Mr. Veall at Boston ; by the Rev. W. Dunbar at 

 Applegarth Manse, Dumfries-shire ; and by the Rev. C. 



(Houston at Sandwick Manse, Orkncv 80 



a2 



