May, 1902. Meteorite Studies, I — Farrington. 301 



breaking rather easily with a blow of a hammer. The specific gravity 

 of the whole aerolite of 74 grams taken with the balance at 2i°C. was 

 found to be 3.504. This value is of course slightly affected by the 

 crust of the stone, but as a fragment without crust weighing 3.4 grams 

 gave the same result the error from this cause must be very small. 



Under the microscope the rock is seen to be a crystalline aggre- 

 gate made up chiefly of grains of chrysolite, bronzite, nickel-iron and 

 troilite. Here and there are traces of a structure which may indicate 

 chondri or fragments of them, but such occurrences are rare. The 

 chondrus-like structures lack definite outline and if of chondritic 

 origin can only be considered fragments. One such fragment seen 

 consists of alternate narrow lamellae of about equal width, of chryso- 

 lite and glass. In another the lamella? of chrysolite are broader and 

 the mass has a border of chrysolite. Another suggests a portion of a. 

 polysomatic chrysolite chondrus. The grain of the stone as a 

 whole is coarse, many of the chrysolite individuals reaching 

 diameters of 0.2 to 0.4 millimeters. These incline to a porphyritic 

 development, although the whole rock is crystalline. The chryso- 

 lite individuals are in general considerably seamed and fissured 

 and stained brown from the penetration of iron rust. Where not 

 stained they are colorless except for scattered minute black inclu- 

 sions which occur in considerable quantity. They occasionally 

 have prismatic outlines but are more often rounded or fragmental. 

 Elongated fibers alternating with glassy or half-glassy lamella? also 

 occur as previously noted. 



A few well-marked aggregations of black, probably carbonaceous 

 matter, occur mixed in a glassy or half-glassy ground mass, the whole 

 having an approximately circular outline, and reaching in one case 

 0.5 mm. in diameter. Here again a chondritic form is suggested 

 but cannot be positively discerned. The carbonaceous matter is made 

 up of smaller black particles not different from those included in the 

 large chrysolite individuals. 



The bronzite usually occurs in the typical fibrous development. 

 It is colorless to yellow, the latter perhaps being due to iron stain. 



Quite frequently large grains of an isotropic mineral appear which 

 I cannot yet refer to any species with which I am familiar. The grains 

 are marked by large size and freedom from inclusions and cracks such 

 as characterize the other silicates of the meteorite. One grain seen 

 has 0.7 sq. mm. of surface, another 0.5 sq. mm., while the remainder 

 are smaller. The outline of the grains is irregular and separated from 

 the remaining constituents. Good cleavage is shown in some of the 

 grains and is apparently cubic, although in one individual the planes 



