HUNTINGTON. — DIAMONDS IN METEORITES. 211 



unaltered. Evidently, then, the mass must have been a meteorite, 

 moving with its smoother face to the front, and perhaps revolving. In 

 such a case the front would acquire the melted appearance observed, 

 and the troilite nodules would at once fuse and become dissipated, 

 leaving the deep and erratic cavities so characteristic of this iron, 

 while the portion in the rear would acquire the well known pittings 

 due to the flaking off of irregular portions. The iron is largely filled 

 with troilite nodules, and that they did not subsequently weather 

 away is evident from the fact that their cavities appear only on the 

 front of the mass. 



The etched surface of the Canon Diablo iron shows great variation 

 in the distribution of the Widmanstattian figures and troilite nodules, 

 and the occurrence of diamond evidently varies likewise. An etched 

 surface of a slab of this iron presented to the author by Mr. Kunz is 

 shown by a photograph, somewhat less than half the natural size, in 

 Plate II. 



A more detailed description of these etched surfaces will appear in 

 a subsequent paper, as the work of isolating and examining the various 

 constituents has not yet been completed. 



