M. Arfwedson's Examination of certain Minerals. 355 



Therefore the proposed function is transformed to 

 x(j7+l)(x+2)(x+3) — 3jr(cr+l)(:r + 2)+4jr + 5; 

 or more shortly expressed to x*V — 3x^V-\-'i<x-\-5; and conse- 

 quently j;-t+3x'-f-2jr-+4x+5=jr^l'—3.r3|'+4jr 5. 



And hence, if j: be considered as the number of the term of 

 a series, and if x*-{-Sx^-^r2x'--\-^x-\-5 be considered as the 



general term, the sum of x terms will be ^— 3^ +2:rM' + 



5x, or m full length ■'— —x{x-{-\){x-\-2) 



{x+3)+2x{x-\-\)+5x. 



[To be continued.] 



LXXI. An Examination of certain Minerals. By Augustus 

 Arfwedson*. 



Cinnamon-stone of Malsjo. 

 pROFESSOR Berzelius, while on a mineralogical journey 

 -*■ in Wermeland, in the summer of 1822, met with a garnet- 

 like fossil, in the lime- quarry of Malsjo in the vicinity of Phi- 

 lippstadt, which bore a great similarity in its external charac- 

 ter to the cinnamon-stone of Ceylon, and likewise exhibited 

 similar properties before the blowpipe. By the following ana- 

 lytical examination, I hope to prove that both fossils, even in 

 their component parts, strongly resemble each other. 



This stone is not affected by concentrated muriatic acid, at 

 common temperatures at least; its adhering calcareous enve- 

 lope is merely dissolved. 1,526 grammes of it, purified in this 

 manner, reduced to powder, and afterwards levigated and dried, 

 were mixed with thrice as much subcarbonate of potassa and 

 exposed to a red-heat. The fused grayish-green mass was dis- 

 solved in muriatic acid, and a portion of silica remained, which, 

 after ignition, weighed 0,625 gram. (a). With the usual pre- 

 caution, in order to prevent the alumina from I'edissolving, the 

 solution was precipitated with caustic ammonia, after which 

 the apparently ferriferous precipitate was placed on a filter, and 



* This paper was originally published in the Transactions of the Royal 

 Academy of Sciences of Stockholm, for 1 822 ; it is given above from a Ger- 

 man translation in Schweigger and Mcinecke's N^eues Journal, band viii. 

 p. 1. 



Y y 2 washed 



