OF ARTS AND SCIENCES. 3 



or less ragged outline, as shown in Figure 2, Plate I., which is a repro- 

 duction from a photograph, much reduced; and the striking outline of 

 a human profile on the right-hand upper corner suggests the possibility 

 that it might have been taken for an image of a god. Its dimensions 

 are, length fifteen and a half inches, height twelve and a half inches, 

 thickness ten inches. The exterior is deeply pitted, and shows signs 

 of fusion, as if the specimen had reached the earth as a complete indi- 

 vidual. Its internal structure consists throughout of a continuous net- 

 work of iron, enclosing grains of more or less transparent green olivine. 

 In certain portions, as would be expected, the olivine has become some- 

 what altered by weathering. One spur of the mass has been sliced, and 

 the slabs show in the unexposed portions beautiful crystals of trans- 

 parenf green olivine. The surface exposed by sawing has an area of 

 about ninety square inches, and exhibits some strikmg variations in its 

 different parts. Some of the olivine appears in two distinct zones, the 

 outer portion being so dark colored that at first sight it appears by 

 reflected light to be black, and on the large section just mentioned this 

 apparent dark olivine occurs most abundantly around the outer edges 

 of the section, extending in some cases an inch or more into the interior 

 of the mass. But it is still more noticeably distributed along a crack, 

 which extends irregularly through the mass and divides the large 

 cut surface into nearly equal halves. This crack is followed through- 

 out its entire length, a distance of ten inches, by an abundant deposit 

 of the dark olivine, the grains being separated from one another 

 by deposits of troilite, while at a short distance from the crack on 

 either side occurs transparent green olivine, wholly distinct from the 

 dark variety, and here the troilite is less abundant. In the original 

 description of the Kiowa County meteorites the peculiar appearance 

 of the olivine is described as follows : " Many of the olivine crystals 

 are in two distinct zones, — the inner half a bright transparent yellow, 

 the outer a dark brown iron olivine. In reality this dark zone is an 

 intimate mixture of the troilite and the olivine, as the analysis of Mr. 

 Eakins and a microscopical examination of the crystals by Mr. J. S. 

 Diller of the United States Geological Survey fully proved."* This 

 description, however, does not notice what is perhaps the most strik- 

 ing feature of the dark olivine, namely, that it is so strongly magnetic 

 that lumps of considerable size will readily jump to an ordinary horse- 

 shoe magnet. Since olivine is not attracted by the magnet, and most 

 troilite only feebly so, and pure troilite not at all, it seems hardly pos- 



* Science, Vol. XV. No. 384, June 13, 1890, p. S61. 



