8 II. A. Ward — Colombian Meteorite Localities. 



the sheen of the kamacite is differently oriented in different 

 individual beams or groups of beams, and in part to the fact 

 that a difference of orientation of the sheen as well as of the 

 etching figures exists in the different areas marked off by the 

 fissures. The iron is not a typical representative of the brecci- 

 ated group, however, for the orientation is not invariably af- 

 fected by the granulation. Sometimes a general orientation of 

 the kamacite beams and of their sheen is to be found, with local 

 disturbances, over areas 8 or 10 cm across. No traces of taenite 

 are visible ; and plessite, if present, is not distinguishable from 

 the closely packed kamacite. 



All of the troilite in the iron has been secreted to form the 

 great cigar-shaped concretions. Schreibersite, although finely 



divided, is an important mineral accessory, filling most of the 

 breccia-forming fissures, and thickly scattered in grains be- 

 tween lamellae. 



Cohen's hypothetical division of the Colombian meteoric 

 irons is thus seen to be correct in so far as it deals with the 

 Santa Rosa locality, and the specimens of ataxitic iron recorded 

 in certain of the meteorite collections under that name are 

 wrongly designated. Apart from the conclusive proof afforded 

 by the structure of the iron, this same conclusion is to be drawn 

 from the fact already stated, that no appreciable amount had 

 ever been removed from the meteorite up to last spring. Brev- 

 ity forbids comment on the large specimen of Rasgata secured 

 at Bogota for the Ward-Coonley Collection further than to 

 state that its structure agrees with that of Cohen's Rasgata. 

 But his justification of his third division, that of Tocavita, 

 finest octrahedrite, is not so certain. There are no snch frag- 

 ments to be found either at Santa Rosa de Yiterbo or in the 

 National Museum at Bogota ; nor is there any record or tra- 

 dition anywhere except in the memoir by Rivero and Bous- 

 sino-anlt of the finding: of such fragments. 



