\ 
14 FIELD CoLUMBIAN MusEuM — GEo toey, VoL. III. 
In sevéral instances a tendency to a ring-like form is observable, 
the diameters of such rings averaging about 2mm. Aggregation of 
the metallic matter in thc 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 aches ama: 
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 inorder 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, 11, pp: 60-62. 
