14 Field Columbian Museum — Geology, Vol. III. 



In several instances a tendency to a ring-like form is observable, 

 the diameters of such rings averaging about 2 mm. Aggregation of 

 the metallic matter in the form of veins is also observable, and 

 constitutes an essential feature of the meteorite. These veins ap- 

 pear in section as thin, irregular lines about .5 mm. in width, while 

 their greatest extent in length noted was 5 inches (13 cm.). 

 There are three such veins to be seen in the stone appearing 

 entirely distinct from one another. In a general way they run par- 

 allel to the broad surfaces of the meteorite, although their course 

 is tortuous and at times becomes somewhat diagonal to these surfaces. 

 They outcrop on the crust surfaces of the meteorite as more or less 

 continuous ridges rising .2 to .3 mm. above the surface. On the 

 face shown to the left in Plate VIII two such outcrops can be seen 

 nearly parallel with the front side of the meteorite. One of these 

 is about half an inch (1 cm.) from the edge, and the other about one 

 inch (2.5 cm.) below the first. As seen in section none of the metallic 

 veins runs entirely through the body of the meteorite. In some 

 sections they appear at the outer edges and disappear in the interior, 

 while in others they appear in the interior but do not extend to the 

 edges. This irregularity of course and extent tends, in the writer's 

 opinion, to confirm his previously expressed view that such veins 

 are phases of structure of the meteorite rather than filled fissures.* 

 The general appearance of two of these veins in section, also the 

 nature of the distribution of the metallic grains in general, is shown in 

 the section represented in Plate XI. Over the triangular surface 

 shown in the lower left hand corner of Plate v, where, as before re- 

 marked, a natural scaling along one of the veins has taken place, 

 the substance of the vein could be examined. The appearance 

 of the surface here exposed was one of uniformly bronze-yellow color, 

 there being no differentiation of ingredients according to color. 

 On removing a portion about 2 cm. square, however, and grinding 

 it to a smooth surface, some of the metallic portions showed a 

 nickel-white color while the rest remained bronze-yellow. This 

 indicated that the vein was made up of aggregated nickel-iron and 

 troilite, and this indication was confirmed by further tests. The 

 nickel-iron grains, some of them several square millimeters in area, 

 were subjected to the action of nitric acid in order to determine 

 whether they showed Widmanstatten figures. None appeared, how- 

 ever, although several trials were made. The action of the acid 

 only produced a minute pitting of the surface of the metal. By 



* Am. Jour. Sci. 4, n, pp. 60-62. 



