166 Field Museum of Natural History — Geology, Vol. III. 



and rounded. They are either convex or concave. The convex sur- 

 faces are of comparatively uniform slope, the concave, irregular and 

 showing depressions resembling pittings, though these are rarely as 

 well-defined as is usual in meteorites. Five of these pits which occur 

 together in one concavity are approximately circular in outline, 

 shallow, and have a diameter of about one centimeter each. On 

 another portion of the stone two similar but smaller pits may be 

 seen and on another portion a larger, crescent-shaped pit. Nothing 

 in the shape or markings of the stone indicates orientation during 

 flight. The general shape of the stone is, as already noted, irregular 

 and the crust remarkably uniform in appearance. In color the crust 

 is dull black with occasionally an inclination to a reddish shade. 

 Seen under the lens it presents a porous, slaggy appearance with no 

 indications of flow. The indications are that the surface fused in 

 place. The pores of the slag are very minute and the crust strongly 

 adherent. Grains of nickel-iron rounded by fusion can be seen here 

 and there and occasionally spots from one to three millimeters in 

 diameter having smoother crust appear. These doubtless indicate 

 portions which for some reason fused somewhat more readily. The 

 color of the interior of the stone is in general brownish-black resem- 

 bling the black chondrites. A marked feature (shown in Fig. 2, 

 Plate LV.) is that of large spots of a much lighter color scattered over 

 the dark ground. These are best seen on polished sections. The 

 color of these spots is a light gray, and so much lighter than the mass 

 of the meteorite as to be very prominent. The spots vary in size, the 

 largest seen covering nearly one square inch of surface. The outline of 

 the spots is irregular but not strongly so, and tends to be curved rather 

 than straight. There seems to be no indication megascopically of any 

 separation other than that of color, of the substance of these spots 

 from the remainder of the mass. The section in which they are best 

 exhibited and that illustrated in Fig. 2, Plate LV, was made near 

 one end of the meteorite. On a section parallel to this made about 

 one centimeter nearer the interior, the larger spots while retaining 

 their relative position were found to be much smaller, less than half 

 the size of those on the outer section. They do not, therefore, extend 

 uniformly through the meteorite. As solid bodies their shape is 

 probably somewhat lens-like or flat-pyramidal. One spot which 

 was small on the outer section was about twice as large on the inner 

 section. Hence the spots are probably to be found scattered irregu- 

 larly through the meteorite. The structure of the meteorite on the 

 whole in respect to these spots is the same as that designated by Bre- 



