102 Dr»Bonsdorffs Analysis [Feb. 



two, p. m. the 25th, al tended with a most violent gale from the 

 south, thunder and lightning, and torrents of rain, amounting, 

 with what had fallen during the previous night, to nearly three 

 inches. On the 29th, the barometer again fell to 27*73, after 

 which, it rose rapidly. From the 16th to the 31st, it never 

 attained 29*00, though the changes in its direction were almost 

 daily, and frequently considerable. 



Temperature, — The mean annual temperature, which is P 

 above that of the preceding year, and is owing to the mildness 

 of the autumnal and winter months, fully compensated for the 

 decrease from the usual averages experienced in May, June, and 

 July, which vrere the only months below the means of the cor- 

 responding periods in 1820. 



Wind. — The prevailing winds are again SW. and W. The 

 N. and S. ones are nearly equal, and the NW. and SE. exactly 

 so. The strongest winds have blov/n from the S. particularly 

 towards the close of the year. 



Rain. — The amount of rain, which has annually and gradually 

 decreased since the wet year of 1816 is less than that of the 

 preceding one, though the last two months have nearly brought 

 up the general average. If the rain be taken from the last 

 quarter of the moon, commencing the 16th uit. up to the same 

 time of the present period (the 15th) the total amount exceeds 

 six inches and a half, a most unusual quantity for these parts. 



New Malton, Jan. 1 5, 1822. J A M ES StO C KTO N . 



Article VII. 



Analysis of Two Finnish Mimra/s. By P. A. Von BonsdorfF, 

 Ph. D. of Abo. (Extracted from Memoirs presented to the 

 Academy of Sciences in Petersburgh.) 



I. Steinheilit,or DichroiteyfromOrrijarvi. 



This mineral occurs in the copper mine of Orrijarvi, in the 

 parish of Kisko, in Finland, and has for a long time been consi- 

 dered as blue quartz; it is found sparingly, and is accompanied 

 with common quartz, greyish talc, and yellow copper ore. 



The colour of this mineral is either light or dark Berlin blue, 

 and sometimes, though rarely, it is nearly colourless. Those 

 frasjments which are pure and of a dark colour, exliibit two differ- 

 ent colours very distinctly, like the dichroite from Spain and the 

 East Indies. In one direction the colour is a deep clear blue, 

 and in the other light grey, and sometimes so light as to be nearly 

 colourless; it is translucent; the lustre of the fragments is 

 glassy ; it is hard, giving sparks plentifully with steel. Accord- 

 iag to Count Steinheil, it occurs in four, six, and eight-sided 



