54 Prof. Maskclyne and Dr. Lang's Miner 'alogical Notes, 



which vary with the inclination of the section to the axis of the 

 crystal. 



There is also another mineral, transparent and presenting 

 cleavages nearly perpendicular to each other, which appears to 

 be distinct from the foregoing. 



What these minerals thus associated in small proportion with 

 the olivine may be — whether they are solely augitic, or whether 

 also the long felspathic-looking bars are really fragments of some 

 felspar — is at present difficult to say with certainty. But in a 

 subsequent article in these Notes I purpose giving all the data I 

 possess for assigning to these and other meteoric minerals 

 their true mineralogical character. 



The Butsura fall, therefore, seems, like other aerolites rich in 

 iron, to approach in character to a siderolite in that the silicates 

 it contains consist, as I believe, for the most part of olivine. 

 This olivine is generally very transparent, and comparatively 

 colourless ; but near the iron particles, and forming a continuous 

 fringe to them, its granules become of a ferruginous colour, and 

 are at times, especially in parts of the Qutahar and Chireya 

 stones, red, like fragments of garnet or zircon. 



The meteoric pyrites is present in a ratio of about one-half the 

 apparent quantity to that of the iron. It is generally in little 

 independent particles of the same average size as those of the iron ; 

 and it sometimes is continuous with the iron in the same particle, 

 like the copper and silver of Lake Superior. 



The Bulloah stone exhibits less of the ferruginous olivine than 

 the others around the iron, and may perhaps contain more of the 

 barred and grey mineral or minerals. The result is a paler hue 

 on it. Its crust, on the other hand, is thicker and coal-black, 

 that on the other stones having a browner cast. 



But the specific gravity of the aerolite seems pretty constant 

 in its different parts, namely about 3*60. 



The next stone in order to the fragments that fell at Bulloah 

 is the thin slab-like piece that fell at Piprassi, marked 3 in the 

 figures. One of the faces of this piece is convex, while the 

 other side presents a somewhat hollowed form. It is nearly 

 rectangular in its general outline. The inner, as well as the 

 outer, side presents some large but shallow hollows or " pit- 

 tings." This piece, as before observed, does not fit on directly 

 to the great mass that fell at Qutahar Bazar; but that it 

 formed a closely contiguous part to it on the original aerolite 

 there can be no doubt. In fact the general contour of the 

 stone, the correspondence of the outline and character of the 

 shallow hollows on both, and, finally, the existence in them of 

 the remarkable vein of nickel-iron before alluded to, and which 

 runs persistently in one plane through each of them from the 



