168 Fretp Museum or NaturaL History — Geo.oey, VoL. III. 
colored liquid has been infused into the mass and affected certain por- 
tions. This infusion appears to have taken place subsequent to the 
cooling of the original magma. The siliceous minerals seen under 
the microscope are chrysolite and bronzite, apparently in about 
equal proportions. They occur as chondri, as fragments of chondri 
and of crystals, and as more or less completely formed crystals. The 
chrysolite chondri tend to be of small size, circular in form and mono- 
somatic. One such chondrus measures .45 mm. in one diameter and 
.52 mm. in the other. -Its border is composed of a series of grains 
more or less circular in outline and .o6 mm. in diameter. A series of 
parallel alternate rods of chrysolite and glass averaging .o3 mm. in 
width fills the interior. All these and the border extinguish simul- 
taneously. Some of the other chrysolite chondri are characterized by 
a porphyritic structure. All the chrysolite is highly fissured, as is 
characteristic of meteoritic chrysolite. The bronzite chondri areas a 
rule less regular in outline than the chrysolite chondri and vary greatly 
in size. The largest seen is nearly 3 mm. in diameter, though of 
irregular boundary. It ismade up of minute parallel fibers of bronz- 
ite .0075 mm. in width and 2-3 mm. in length. Other chondri show 
eccentric-radiated, parallel or irregular arrangement of fibers. One 
conspicuous chondrus is of oval outline, 6 mm. in its longest 
diameter and is composed of seven fan-shaped rays of bronzite set 
in an opaque background. The rays radiate from a point near 
the circumference of the chondrus and widen as they pass toward 
the opposite periphery. Each ray is divided into two longitudinally 
and there is a more or less sharply marked border of bronzite. The 
chondrus as a whole has circular polarization. Another chondrus of 
somewhat rectangular outline 1s about half composed of well-crystal- 
lized bronzite and the remainder passes into a series of half-glassy 
fibers. Narrow black veins evidently subsequent in origin to the 
chondri cut through the sections. The nickel-iron occasionally exhibits 
a tendency to follow these veins. The nickel-iron and troilite grains 
are megascopically of amoeba-like outlines and evidently formed 
subsequent to the chondri. The crust when seen in section on the 
darker portions of the meteorite appears as a black, opaque band about 
.4 mm. in width. Owing to the dark color of the interior the crust 
is not easily distinguished from it. It is certain, however, that it 
does not exhibit the zones usually characterizing the crust of chon- 
dritic meteorites. As none of the sections prepared for study showed 
crust bordering the light-colored portions, no study of this could be 
made. 
