62 . On the Irun Meteorite 



shows several of these extruding nodules of carbon. 



The lines of flow of the melted crust are beautifully shown,- 

 especially when slightly magnified, and exhibit well the surface- 

 fusion due to the rapid flight of the body through the earth's at- 

 mos])here. 



Tiiat tlie motion of the mass in its flight was rotary, is clearly 

 })roYen by the abutment of the crust-])arricles against the pro- 

 jecting suifaces and the sti'i^e of the cru-t at these ])laccs, which 

 lesemble, in minute forms, limonite iron ore. The abrasion due 

 to impact was very slight, and seemingly not more than wouhl 

 have happened had the mass been dropped a few hundred feet. 

 Some places were noticed where very small pieces had been de- 

 tached by the force of the impact, but in all not over 2 or 3 

 grams were thus lost. 



The analysis, by J. B. Mackintosh, E. M., confirms the oft- 

 noted similarity in the composition of meteoi'ic-irons ; to show 

 this forcibly I here append a few analyses made on irons seen to 

 fall: 



Rowton. Charlotte.X Estherville.% 





Mackintosh. 



Flight. 



Smith. 



Smith. 



Iron. 



91.26 



91.25 



91.15 



92.00 



Nickel, 



- 7.845 



7.825 



8.05 



7.10 



Cobalt, - 



0.653 



0.371 



0.72 



0.69 



Phosphorus, 



- 0.30 





0.06 



0.112 



100.058 100.203 99.98 99.902 



Lawrencite (fei rous-chloride) was noticed, by its deliquescence 

 on the surface of the meteorite, in the deeper depressions, which 

 deliquescence I would state, has all occurred since last August, 

 as the surface of the mass did not show any oxidation when re- 

 ceived. 



No effort has as yet been made to analyze the graphite or to 

 find the quantity of occluded gases in the Mazapil iron, — for the 

 reason that such a task would only result in a repetition of the 

 labors of Flight, Mallet, Graham and others. 



t Am. Jour. Sci., X, 1875, pp. 349-352. Com. Eend., LXXXI, 1875, 

 pp. 84-87. 



§ Fell May 10, 1879, and consisted of metallic nodules surrounded by sili- 

 cates. Am. Jour. Sci., XIX, 1880, pp. 459-463. 



