174 Field Museum of Natural History — Geology, Vol. III. 



of the iron was quite resistant and hence the cutting was performed 

 with some difficulty. Beneath the surface the iron is relatively soft. 

 The depth to which the hardening extends is small and unmarked by 

 any change of structure that can be observed either on etched or 



Fig i . Etching figures of Quinn Canyon meteorite. X 2. 



unetched sections. Mr. Jenney describes the meteorite as covered 

 with a "thin, smooth skin of magnetic oxide" which he considered 

 to have protected the mass from corrosion. It is true that the color 

 of the surface of the meteorite is brownish-black as compared with 

 the nickel-white color of the interior, and this surface color probably 

 indicates superficial oxidation. The coating of oxide is, however, 

 exceedingly thin. The interior of the iron is of nickel-white color 



