12 Fietp CoLuMBIAN Museum —GeEo oey, VoL. III. 
meters independently and are usually very minute. The appearance 
of the substance of the crust is like that of black obsidian, being 
black, opaque and of pitchy luster. The crust adheres firmly 
throughout to the interior, showing no tendency to scale. There is 
a noticeable uniformity in the direction in which the threads of 
fused matter run on the different faces. Such directions are 
shown in some of the photographs, notably Plates V and VII. 
In the face*shown in Plate VII it is observable that the 
drift is in the direction of greatest length along the middle line, 
with diversions to the rear side. If a feather, the barbs of which 
had been removed from one side of the midrib, were laid along the 
surface the directions of the remaining barbs would indicate quite 
accurately the directions of drift. The drift on this face may there- 
fore be described as pinnate. On the face shown in Plate V there is 
drift radiating from the center outwards. On the face shown in 
Plate VI, or rear side of the meteorite, the drift tends to follow the 
direction of greatest length, though modified by radiation outward 
from the pits. 
The crust studied in thin section under the microscope shows 
nearly all the zones described by Borgstrém. The first, third, and 
fourth are manifest, but the second zone, or “‘ thin brownish layer,” 
which he describes, is not visible in any of the sections which the writer 
has examined. The failure of this Zone to appear may be due to the 
thickness of the sections, but if so it would require unusually thin 
sections to show it. The intervention of the colorless, or third, zone ~ 
between the dark first and fourth zones is a striking phenomenon 
and lends a high degree of probability to Borgstrém’s view that the 
fourth zone is due to alteration of interstitial glass rather than to 
a penetration of molten matter from the surface. The thickness 
of the several layers, as observed by the writer, accords with that 
noted by Borgstrém, except in the maximum thicknesses which he 
quotes. The total crust on the small stone is rarely more than .3 mm. 
in thickness. Fragments of the meteorite heated B. B. turn black, 
shading to red distant from the flame and fuse on the edges to a 
black slag. 
The meteorite as received at the Museum was penetrated by 
several small cracks extending in a general way at right angles to 
its broad surfaces. The courses of some of these can be seen in 
Plate V. Mr. Shie 5, finder of the meteorite, states that he noticed 
them the second day after digging the stone up. They probably 
indicate therefore a partial shattering of the meteorite due to its 
