ii2 Field Columbian Museum — Geology, Vol. III. 



chondri composed of porphyritic anhedral olivines or of olivine and 

 enstatite also occur. These olivines frequently reach a length of 

 .2 - .3 mm. and have well-defined prismatic outlines. The interstices 

 between the crystals are usually filled with a turbid glass. The out- 

 lines of these chondri as a rule are less well-marked than are those 

 composed of olivine and glass. Most of the chondri have spheroidal 

 outlines, though a few fragmental forms occur. Among the constitu- 

 ents of the general mass, lath-shaped crystals of enstatite .3 - .5 mm. 

 in length, with cleavage parallel to the direction of length are the most 

 conspicuous. These and the enstatite chondri are sufficiently numer- 

 ous to indicate a large proportion of this mineral in the constitution of 

 the mass. Besides enstatite, grains of olivine of various sizes and 

 outlines are to be seen in considerable quantity. 



Plate XXX, from a photograph made by the writer about six 

 months after the fall, shows the place of fall of the 178 lb. mass. The 

 point was the base of the tree in the foreground. The meteorite in 

 falling grazed the tree at the right, leaving a scar the observation of 

 which by a squirrel hunter led to the discovery of the mass. Erection 

 of a pole connecting the scar and the place of fall of the meteorite 

 seemed to the writer to indicate a nearly vertical direction of fall. 

 Miller,* however, estimated the angle to be 77 with the horizon, or 

 13 from vertical. The large roots of the tree prevented the stone 

 from going deeply into the soil, and it was found resting on them. 

 Considering the weight of the mass and the distance of its fall it is re- 

 markable that it was not shattered by the impact and that the roots 

 on which it fell were not more deeply bruised. 



CHUPADEROS. 



The two known masses of this meteorite were found, as was stated 

 at an early period, lying only about 800 feet apart. This proximity 

 and the jagged surface to be found on each renders it very probable, 

 as was suggested by Daubree,f if not earlier by others, that the two 

 pieces once constituted a single mass which was torn apart during its 

 tall to the earth. The probable dimensions of this mass were given 

 by Daubree as follows: Length 4.65 m. (16 feet), width 1.50 m. (5 

 feet) and thickness 0.45 m. (22 inches). The dimensions thus ob- 

 fained by Daubree were evidently arrived at by assuming a joining of 

 the two masses end to end. Such a joining, however, would not place 

 the torn surfaces together. In order to determine what the form and 



* Science, 1903. N. S. Vol. XVIII, p. 244. 

 t Comptes Rendus, 1889, Vol. CIX, p. 726. 



