292 Field Columbian Museum — Geology, Vol. I. 



As individual grains they are, however, smaller in size. Often the 

 nickel-iron and troilite can be seen to be intergrown in a single grain. 

 Before the blowpipe a fragment of the rock fuses even in the oxidiz- 

 ing flame with a fusibility of about 4.5, the entire fragment blackening 

 from the formation doubtless of FeO. In the reducing flame the 

 fusibility is, as would be expected, greater on account of a more rapid 

 formation of FeO. Evidently the mixture of minerals forms an 



Fig. 3. Polished surface of Long Island meteorite showing size and distribution of metallic grains. 

 Fully half of these are troilite. The light irregular lines mark the position 

 of fractures of no significance. X y. 



aggregate fusible at a lower temperature than any of its components, 

 for the component minerals are practically infusible. 



The specific gravity of the stone, determined as an average of 

 three separate portions weighing 50, 18 and 7 grams respectively, 



is 3-45- 



As previously stated, a description of the petrographic characters 

 of the stone has been made by Weinschenk*, and as it seems desir- 

 able to collect here all the important literature bearing on the mete- 

 orite, a translation of Weinschenk's article follows: 



"From the Long Island, Phillips County, Kansas, occurrence I 



*Loc. cit. 



