156 



Mr. N. Story-Maskelyne on Meteorites. [Jan. 13, 



Omitting the silicate attached to the iron, the results of the analysis were as 

 follow : — 



Iron-nickel alloy 98*798 



Iron 94-949 



Nickel 3-849 



Schreibersite 1*202 



Iron 0*884 



Nickel 0-234 



Phosphorus 0*084 



100 000 



The quantity was far too small to encourage a search for cobalt and 

 other metals. 



Besides the nickeliferous iron, which is disseminated very sparsely, and 

 in particles singularly unequal in size and distribution, and with which 

 troilite is associated in very small quantity, chromite is present as a con- 

 stituent of small but appreciable amount. The crystals of this mineral are 

 distinct and brilliant, and sometimes present good angles for measurement. 

 One gave the solid angle of a regular octahedron. 



The Manegaum Meteorite of '1843. 



This meteorite fell at Manegaum in Khandeish, India, on the 26th 

 July, 1843. Only a small fragment was preserved, and of this a portion 

 was given by the Asiatic Society of Bengal to the British Museum in 1862. 

 In 1863 I described its appearance as seen in section in the microscope, 

 and gave the particulars of its fall (Phil. Mag. August 1863). 



From the minuteness of the specimen I had very little material to work 

 upon. One mineral is conspicuous in the stone, namely, a primrose- 

 coloured transparent crystalline silicate in small grains, loosely cemented 

 by a white flocculent mineral. This greenish-yellow mineral (I.) and a 

 fragment of the entire meteorite (II.) were analyzed, and crystalline grains 

 of the former were measured on the goniometer. The prism angles (1) 

 for the prism {110} were about and (2) for the prism {101} were 

 for {100, 1 10} about 46°; for {100, 101}, 49° 4'; andfor{110, 101} 

 58° 39'. 



The analyses gave the following numbers : — 



j Oxygen n Oxygen 

 ratios. ratios. 



Silicic acid 55-699 29706 53*629 28-602 



Magnesia 22*799 -j 23'32 ~| 



Iron oxide 20-541 I 14-059 20*476 I 14*305 



Lime 1-316 J 1*495 J 



Chromite 1-029 



100-355 , 99-949 



