Dr. Walter Flight — History of Meteorites. 411 



the stone, is another silicate, which proved to be an enstatite like 

 that of the meteorite of Bishopville (1843, March 25th). 



It presents the appearance of a number of more or less fissured 

 crystals, with different degrees of transparency, and with a more or less 

 symmetrical polygonal outline, embedded in a magma of fine-grained 

 silicate. Three varieties of this mineral are described: I), a dark- 

 grey glistening crystalline substance, tabular in form, very opaque, 

 and presenting cleavages indistinctly marking the faces of a prism for 

 which the mean of several measurements gave an angle of {gp^}; 

 II). a colourless transparent variety, which is rare ; and III), a grey 

 semi-transparent splintery mineral in very composite fragments. 

 The following additional measurements were made of this mineral : 



Breitenbach enstatite. 



100, 110 = About 46° 45° 52' 



110, 110 = 87° 10' to 88° 0' 88° 15' 



100, 101 = 41° 34' 41° 12' 



010, Oil ? = About 40° 40° 21' 



The planes 100 and 110 are cleavages. The chemical examination 

 of these three varieties yielded the following per-centage numbers : 

 I. II. III. MgO,Si0 2 









f 





i 





Silicic acid 



.. 57-597 



58-437 



57-037 



57-961 



57-754 



60-000 



Magnesia 



.. 40-640 



38-942 



40-574 



39-026 



38-397 



40-000 



Lime ... , 







1-677 



2-294 



1-524 



2-376 



— 



Iron oxide 



... 1-438 



1-177 



0-867 



0-154 



0-423 



— 



Potash ... , 



... 0-394 



0-332 



— 



0-569 



0-569 



— 



Soda , 



... 0-906 



0-357 



— 



0-680 



0-657 



— 



Lithia 



— 



— 



— 



— 



0-016 



— 



100-975 100-922 100-772 99-914 100-192 100-000 



By acid each variety was acted upon to some extent ; the action, 



however, was found to be simply that of a solvent. 



The meteorite also contains a little nickel-iron and schreibersite, 



having the composition : 



Tv-r. , , • (Iron 94-949 



Nickel-iron \ Mckel 3 . 849 



(Iron 0-884 



Scbreibersite } Nickel 0-234 



( Phosphorus 0-084 



100-000 

 a very small quantity of troilite, and a small but appreciable amount 

 of chromite, a crystal of which gave the solid angle of a regular 

 octahedron. 



The memoir is illustrated with two plates, the one showing very 

 carefully drawn microscopic sections of the augite and enstatite, the 

 other views of the stone and a section of the nodule containing the 

 oldhamite spherules. Plate XL is an endeavour to reproduce, by the 

 chromolithographic process, a very elaborate water-colour sketch of 

 this interesting stone prepared by my friend Mr. Edward Fielding. 

 On the upper portion of the section towards the right hand is seen 

 the area where the spherules of the calcium sulphide and some large 

 crystals of the augite are situated ; below is a pepita of nickel-iron, 

 the occasional white patches indicating large crystals of enstatite. 



