OF ARTS AND SCIENCES. 5 



cracks of the olivine, while portions of the olivine near the troilite 

 changed to various shades of red and yellow, the darker portions being 

 strongly magnetic. Otherwise, the olivine retained all its former char- 

 acteristics of crystalline form and cleavage. Moreover, portions of 

 the artificial product could be selected which would so closely resemble 

 similar specimens from the meteorite, that, after they had been once 

 mixed together, they could not be distinguished. This seemed to show 

 conclusively that the dark outer zone of olivine is a mixture of troilite 

 and olivine only in the sense above indicated. 



On an exammation of the slabs of this iron by etching, certain other 

 features appear which in part connect it most closely with the Pallas 

 and Prehistoric irons, and in part are peculiar to the Kiowa County 

 iron alone. 



The olivine crystals are in the first place surrounded by a deposit 

 of what is probably the purer iron. This border is of varying thick- 

 ness, not generally exceeding one or two millimeters, and occasionally 

 wholly disappearing. Parts of the border are most beautifully marked 

 by innumerable Neumann lines, microscopically fine, and so numerous 

 as to give it a silvery appearance and a brilliant lustre that at once 

 strike the eye. Between this iron border and the olivine come 

 masses of troilite, and these fill the space between the olivine crystals, 

 and thus have the same kind of outline as the iron network, and 

 appear as a continuation of the network. Troilite, however, also 

 occurs in small nodules in the iron itself, and sometimes asfain as 

 the central portion of an olivine crystal. Such a quantity and dis- 

 tribution of the troilite appear in no other meteorite except the 

 original Pallas. A further resemblance between these last named 

 meteorites is brought out in the occurrence of schreiberseit. This 

 mineral is at once distinguished by the eye from the troilite, on account 

 of its brighter lustre, granular structure, and more silvery color. Fur- 

 thermore, it is harder, and strongly magnetic. The schreiberseit oc- 

 curs in close connection with the troilite, usually in patches coming 

 between it and the iron, but frequently portions of schreiberseit project 

 into the iron itself, sometimes in elongated masses reaching a lensfth 

 of half an inch or more. In such cases the iron borderinff on the 

 schreiberseit has the same characters as when in contact with the 

 olivine crystals, as just described. 



The main portions of the iron show a most perfect crystallization, 

 which is very beautifully brought out by etching. Crystal plates start 

 out from the iron border already mentioned, and reach back through 

 the whole extent of the interior iron. The figures thus produced are 



