Meteoric Stone ivhich. fell at tJic Mission Station of St Mark s. 3 



The back (Plate II., Fig. 1) is flat, and is covered with shallow 

 pittings, lying close together, and mostly circular. The diameter 

 averages 1^ cm., variations above and below being only small, and 

 the pittings look like the impressions made by the thumb upon a 

 piece of soft clay. Their distribution over the surface is very regular 

 up to near the margin. The crust is brownish-black, finely wrinkled, 

 with a dull to shining lustre. The cavities, from 1 to 2 mm. across, 

 a great many of which can be distinctly seen in the photograph, are 

 probably due to the melting out or the breaking out of chondrules 

 rather than to escaping gas ; perhaps they are to be referred partly 

 to the one cause, partly to the other. The very fine, shallow, yet 

 clearly defined wrinkles, with which the whole surface is uniformly 

 covered, anastomose in the most dainty manner. Towards the 

 centre they form a fine network with more rounded meshes ; on the 

 bordering parts these are long drawn out, so that a di'ift-effect is 

 produced, which is directed towards the border, and shows particu- 

 larly well at the projecting top solid angle (Plate II., Fig. 1). Close 

 to this there appears on the photograph a narrow lighter strip, which 

 is due to the fact that just here the crust is somewhat slaggy, so 

 that when the photograph was taken the light was not reflected in 

 the same way as on the other parts of the surface. 



The second principal surface (Plate II., Fig. 2) is somewhat 

 undulated, and slightly sunk in, like a saddle. It also shows thumb- 

 marks which, on the whole, are very like those above described, and 

 may be due to the same cause ; they are, however, not quite so 

 regularly distributed, and vary a little more in size, depth, and 

 shape. The majority are here also round and very shallow, but 

 some are oblong, and then generally somewhat deeper, though not 

 so deep as they seem on the photograph, particularly on the left 

 half, in consequence of the deep shadows cast by the artificial light. 

 Hollows which may be due to loosened chondrules appear, but only 

 here and there. 



The crust which covers the whole surface is somewhat more shin- 

 ing than that on the back. The lustre becomes more like varnish ; 

 the colour is black, and is apt to pass into steel-blue in the hollows, 

 and to brownish on the prominences, thus giving to the surface 

 a slightly chequered appearance. From the somewhat eccentric 

 crown there radiates uniformly in all directions a perfect drift-effect, 

 in the form of shallow but very sharp striations due to fusion. These 

 are somewhat broader and more rounded than the wrinkles on the 

 back, and they differ from these, too, in the fact that they run on the 

 whole in straight lines without marked anastomosing, and can be 



