Oct., 1907. METEORITE Stupies II — FarRINGTON 127 
_ Except where it has scaled off in small areas the meteorite is cov- 
ered with a firmly adherent, dull brown-black crust, rough from the 
protrusion of thickly scattered metallic grains. These grains are 
darker in color than the rest of the crust, probably from a coating of 
iron oxide. When this coating is scraped away, however, the bright 
nickel-white color of the metallic grains is seen. One of the grains 
showed bright when the meteorite was received, but it may perhaps 
have become so through handling. It is the largest single grain to be 
seen. Ithasa hemispherical form anda diameter of5 mm. The shapes 
of the other metallic grains as they protrude are various. Some are 
elongated, some nearly circular and others form small connecting 
groups. For the most part the grains are independent of each other, 
but there are two well-defined groups of them extending in irregular 
lines and standing out like veins. These are not straight in their 
eourse but nearly so. The extent of each is about 6 cm. (2% inches). 
-One runs from the large grain mentioned above, the other is nearly 
parallel to it 7 inches (18 cm.) distant. 
Besides being broken by the protrusion of the metallic grains, the 
crust is seamed and fissured by numerous cracks extending in all direc- 
tions and varying in extent and depth. The largest has a length of 6 
inches (15 cm.), and from this to the minutest fissures all gradations 
occur. The course of most of the cracks is straight towards the inte- _ 
rior of the meteorite, but some run so as to tend to scale off. They 
give the exterior of the meteorite a ““baked”’ look and there can be 
little doubt that they are the result of differential expansion through 
heat of the interior as compared with the exterior. Scaling of the crust 
had occurred at various points when the mass reached the Museum. 
Many of these scalings must, on account of their freshness, have 
- occurred very shortly before the meteorite struck the earth or from the 
force of impact. Most of the surfaces thus exposed were covered with | 
an adherent coating of carbonate of lime when the stone was received 
at the Museum. The lime undoubtedly deposited more readily here 
on account of the increased capillary attraction afforded by such sur- 
faces. The color of these surfaces was for the most part rusty brown 
from exposure, but a few were of a greenish-gray color where the car- 
bonate of lime was freshly removed. In addition to these wholly un- 
crusted surfaces one about three inches square had a very thin black 
crust, much thinner than the average crust. It is evident that at this 
point a piece scaled off from the meteorite during its passage through 
the air and time sufficed for only a partial fusing of the freshly exposed 
surface. 
Internally the substance of the meteorite when freshly broken is 
