Natural History. 439 



The stone from Juvcnas resembles other meteoric stones in its 

 aspect, but is more friable than most of ihem. It contains no glo- 

 bules of iron sensible to the pestle, but small crystals may be seen 

 in it, having an evident cleavage, which have received the name of 

 feldspar, and appear by analysis to be that substance. Acids only 

 acted on it partially, but after fusion with potash, its elements, 

 by further treatment, readily separated fromeach other. They 

 are given as follows : 



Silica 40, 



Oxide of iron .... 23.5 

 Oxide of manganese . . 6.5 



Alumine 10.4 



Lime 9.2 



Chromium 1-0 



Magnesia ...... 0.8 



Sulphur 0.5 



Totash 0.2 



Copper 0.1 



Loss from unknown causes 4.8 

 indispensable . . . 3.0 



100.0 



The circumstance of a constant loss, rather than an increase of 

 weight, induces M. Laugicr to conclude that the iron and manga- 

 nese are in the state of oxides in the stone. When powdered, no 

 part of it was attracted by the magnet. The loss, however, re- 

 mains unaccounted for. When a portion of the stone was distilled 

 it lost in weight, but M. Laugier could not satisfy himself of the 

 substance gone off ; it was neither water nor carbonic acid gas. 



The analogy of this aerolite to that of Jonsac is remarkable : 

 the entire absence of nickel, the disappearance dmost complete of 

 the sulphur and magnesia, with the presence of an abundant quan- 

 tity of lime and alumine, establish a considerable difference be- 

 tween these two stones and those previously known to have fallen 



from the air, i • i r n .i 



Reference is then made to several other aerolites which tell the 

 13th of December, 1813, in the neighbourhood of Lantela, in the 

 government of Wibourg in Finland. Mr. Nordenskiold, who exa- 

 mined them, describes them as very friable, containing grains of 

 olivine, and also amphigene, scarcely at all attracted by the mag- 

 net, and containing no nickel. 



Considering the difference in aspect and composition between 

 these three stones and those which were previously known, M. 

 Laugicr thinks that these substances may be arranged m two 

 classes, but he does not insist much on this division.— /inna/e* de 

 Chim. xix. 264. (See our Foreign Science.) 



