1 58 Intelligence and Miscellaneous Articles. 



may assume, with certainty, that it is carbonic acid which is lost by 

 ignition, but we cannot determine with which base it had been com- 

 bined ; most probably with all three, for the three sorts of carbonates 

 are found in almost immediate contact with each other. Now if we cal- 

 culate on the last values obtained, being the more carefully determined, 

 and if we assume that the three bases are combined with the quan- 

 tity of carbonic acid in the same proportions in which they are found 

 throughout, then the lime becomes \'2\ ; magnesia 0'90; and pro- 

 toxide of manganese 0'25. After subtracting these carbonates and 

 the insoluble matter, the remaining constituents give the following 

 proportions, to which we shall add the twofold calculation from the 

 atomic weights, and from the quantity of oxygen present in each body. 

 Ca O.... 7 199-5 20-90 20-81 5-84") 



MgO 7 144-2 15-11 15-50 6-02 V12-81 3 



MnO 1 35-7 3-74 4-22 0-95J 



As Ooi.. 10 575-0 60-25 59-47 20-69 5 



954-4 100-00 100-00 

 The formula hence derived is 



/li Ca O + As Oo A , /li Mg O -I- As 0,A 

 V^VMnO. /■^Vj-VMnO / 



or, after the mode of Berzelius, 



3 Ca O •] 



3 Mg O V Aso O,. 



3 MnO J 

 This mineral requires a particular name as a new combination. 

 Neither the composition nor the external properties are sufficiently 

 marked to be expressed by it. I shall therefore make use of a cus- 

 tomary resource in mineralogy, and call the substance after one who 

 has advanced the science ; and as no one doubts that Berzelius, who, 

 through the invention of the doctrine of proportions and the for- 

 mation of formulae, as well as tlirough his innumerable most accurate 

 analyses of mineral bodies, has done so much true service to mine- 

 ralogy, should be awarded as much honour as those whose names 

 are only brought into the science through the friendship or partiality 

 of some mineralogist, I do not hesitate to propose calling this new 

 compound, first found in Sweden, by the name of Berzeliit, 



REMARKABLE SOLAR BOW. 

 To the Editors of the Philosophical Magazine and Journal. 

 Gentlemen, 

 The following account of a meteorological phsenomenon of, I be- 

 lieve, rather a rare character, may not be uninteresting to you. 



Being at St. Day with J. S. Enys, Esq., on the afternoon of De- 

 cember 24th, 1840, my attention was called by that gentleman to a 

 solar arc in the west. Around the western horizon were broken 

 masses of cumuli, between and above which the sky was deeply blue, 

 and with the exception of a few light cirri, quite free of clouds. 

 The sun was not more than ten degrees above the horizon ; and, at 

 an angle of not more than 1 2 degrees between the hills to the west of 

 St. Day, appeared the limb of a solar bow, strongly painted, but 



