230 ROCHESTER ACADEMY OF SCIENCE. 



end, where a portion 50 mm. in thickness has at some time been 

 removed, naturally or by applied force. The whole exterior of 

 the mass is of a dark brown color, slightly tinged with reddish hue 

 at the more oxidized places. The color of the crust is somewhat 

 darker and less dull than the balance. In fact, this crust is quite 

 shining or varnished at places. The fractured stone is of a very 

 even granular structure, with no separate or distinct crystalline 

 surfaces, but it is lightened everywhere by very minute shining 

 points which, even to the naked eye, show themselves as grains of 

 bright metallic iron. Among these are other less bright points of 

 troilite. Both are myriad in number, and together they constitute 

 fully one-third in volume and more than one-half in weight of the 

 whole mass. The silicates are bronzite and olivine, closely 

 blended and chondritic in character. These chondri, clearly appar- 

 rent only with a glass, are so crystalline and firmly united that 

 they break with the mass. This compactness is somewhat 

 enhanced by a slight oxidation which has the efifect of binding all 

 closely together, and at the same time of obscuring the visible 

 structure. We place Cobija unhesitatingly among the crystalline 

 chondrites Ck. It very closely resembles both Klein Menow and 

 Pipe Creek, but differs from the former in being more compact 

 and from the latter in not being veined. 



The weight of the original mass of Cobija was 3,690 grams. 

 The largest remaining piece, weighing 1,805 grams, is in the Ward- 

 Coonley Meteorite Collection. 



CHANARAL. 



In the mineral collection of the School of Mines at Santiago 

 de Chili, is a small siderite which is especially interesting by reason 

 of its form and perfection of surface markings. I owe to Pro- 

 fessor Julio Laso, the able and courteous custodian of the collec- 

 tions, the privilege of photographing the specimen, together with 

 a fragment for analysis and for my own collection. Professor 

 Laso informed me that this iron was found in 1884 by Don 

 Roberto Bugde on the desert of Atacama, a short distance in the 

 interior from the Port of Chanaral. This is latitude 26° 30' S. and 

 between longitude 70° and 70° 30 W. In fact, it is very near to 

 the locality before given for the pallasite Ilimaes. The meteorite 



