1886.] NATURAL SCIENCES OP PHILADELPHIA. 36T 



Its crust is very thin and mostly free from rust, only here and 

 there covered with small spots of the same. It shows one fracture, 

 which, however, cannot be seen on the photographic representa- 

 tion on Plate IV, as it is on the opposite side near the indentation, 

 and extending for about 15 cm, ; its widest part is about 10 mm. 

 in size. 



This meteoric iron appears to be an original whole mass, and 

 not a fragment torn off from a larger one ; its surface is pitted 

 all over and shows numerous depressions and excavations, from 

 a few centimetres in diameter and depth to about 15 cm, in length, 

 8 cm. in width and nearly 5 cm. in depth. The photograph shows 

 beautifully the pitted appearance of the mass. 



Its original weight was nearly 115"5 kilos.; probably 25 kilos, 

 have been cut off in slabs which have been distributed amongst 

 learned societies and individuals. 



The crystalline structure of this meteorite is beautifully shown 

 on three etched slabs which are represented in their natural size 

 on Plate Y, 1 from my cabinet, 2 in the Vaux Collection, and 3 in 

 the general collection of the Academy of Natural Sciences. All 

 three show the very perfect octahedral structure of this meteorite. 

 The specimen presented to me by Mr. Raht gave on etching 

 exactly the same crystalline structure, which adds another proof 

 that both came from the same piece. 



The usual constituents of this class of meteorites are quite 

 perceptible: the Kamacite (Balkeneisen) largely predominating 

 and forming bands from 1 to 3 mm. in width. The Taenite 

 (Bandeisen) enveloping the Kamacite, frequently subdividing in 

 narrow lines the broader bands of the latter. The length of the 

 Kamacite individuals is from 1-5 cm. to 2 cm. It has a dull gray 

 color; when magnified, it can be seen to be intersected in every 

 direction by very fine lines, probably of Schreibersite. The Pies- 

 site, somewhat darker than the Kamacite, mostly shows a very 

 fine crystalline, mottled structure (moire metallique) and a 

 glittering lustre ; a small portion, however, is quite dull and 

 much darker. ^ 



On my specimen, fig. 1, Plate Y, there is in two places a remark- 

 able admixture of an iron which is a great deal smoother and 

 hardly shows any crystalline structure. One begins about 9 mm. 

 below the right-hand corner, fii-st forming a somewhat oval mass 

 of 2 to 3 mm. in diameter and then extending in a dagger-shaped 



