Dr. Walter Flight— On Meteorites. 



167 



Iron protoxide 

 Manganese protoxide 

 Nickel protoxide 



Lime 



Magnesia 



Soda 



Potash 



Iron 



Nickel ... ... 



Cobalt 



Phosphorus ... 



Sulphui- 



Chlorine 



10-29 

 0-25 

 0-20 

 1-61 



23-16 

 0-62 

 0-15 



21-10 

 1-61 

 0-17 

 0-01 

 2-27 

 0-04 



Of tliese ingredients, 4"51 



100-00 

 per cent, constitute magnetic pyrites, 

 and 14-65 per cent, nickel-iron, the composition of which appears 

 to be — 



Iron 90-78 



Nickel 8-29 



Cobalt 0-88 



Phosphorus 0-05 



100-00 

 The portions (I.) gelatinisable with and (II.) unacted upon by 

 acid have the following composition : — 



I. 

 Silicic acid 36-76 



Phosphoric acid 



Alumina 



Iron protoxide . . . 

 Nickel oxide 

 Manganese oxide 



Lime 



Magnesia 



Soda 



Potash 



Chlorine 



0-83 



0-13 



20-35 



0-60 



0-64 

 40-47 

 0-18 

 0-16 

 0-13 



II. 



57-37 

 0-07 

 5-07 

 8-03 



0-63 

 3-41 

 23-54 

 1-38 

 0-23 



100-25 99-73 



In the soluble portion the oxj'gen ratio of acids to bases is 

 20-08: 21-16, and in the insoluble part 30-64: 15-08. In addition 

 to olivine and bronzite, this meteorite appears to contain an insoluble 

 felspar and a little apatite. 



The Meteoric Irons of the Mexican Desert.^ 



Dr. Lawrence Smith takes stock afresh of our knowledge of the 

 masses of meteoric iron of that region of Mexico called the Bolson de 

 Mapini, or the Mexican Desert, situated in Cohahuila and Chihuahua, 

 two of the northern provinces of the Mexican Eepublic. In 1854 

 he described three masses, two of which (one weighing 630 kilo- 

 grammes, and the other 125 kilog.) were subsequently conveyed to 

 the United States ; in 1868 eight other masses, the largest of which 

 weighed 325 kilog., were conveyed to the United States ; and later 

 still, in 1871, Dr. Smith published a description of a still larger 

 block, estimated to weigh 3,500 kilog., now lying in the western 

 1 J. L. Smith, Amer. Journ. Sc. 1876, xii. 107. 



