in the British Museum } fyc. 



537 



Soluble in acids. 



Insoluble. 



Silica 



33*05 



57-72 



Magnesia .... 



32-07 



21-40 



Oxide of iron . . , 



, 24-10 



15-51 



Alumina .... 



. 1-04 



2-16 



Sulphuret of iron . 



. 8-70 





Oxide of manganese 



» • « • 



0-60 



Chromic iron . . , 



t • • • 



1-30 



98-96 



98-69 



The entire composition of this aerolite may therefore be repre- 

 sented as follows : — 



flron . 

 Alloy of iron and nickel . < Nickel 



[^Residue 



rSilica . • . 

 I Magnesia . . 

 Soluble in acids .<( Oxide of iron 



Alumina . 



Insoluble in acids -< Q x -j e f 



Alumina 



22-501 

 1-43 y . . . 

 0-79J 



10-00"| 



9-67 



6 . 45 f3RO + Si0 3 



0-31 J 



LSulphuret of iron 2'34 FeS 



Silica .... 26-43' 

 Magnesia . . . 9*80 

 Oxide of iron . 7*10 



24-72 



1 



>3RO+2SiO ; 



J 



28-77 



manganese 0*30 



>44-71 



.Chromic iron 



0-53^ 



0-59 FeO + Cr 2 3 



98-20 



The composition of the soluble portion, Professor Escosura 

 remarks, corresponds to the formula of the tribasic silicates, 

 3RO + SiO 3 , which is analogous to the variety of olivine called 

 hyalosiderite. 



The insoluble portion can be represented by the formula of 

 the sesquisilicates, 3RO + 2Si0 3 , which may best be referred to 

 some varieties of augites (probably anthophyllite). 



The small specimen of the Nulles aerolite in the British Mu- 

 seum is a portion of that sent me last year by Professor Balcells 

 himself, and is remarkable for the unusually large quantity as 

 well as size of the metallic particles it contains ; in this respect 

 it resembles the Macao stone, and, like most specimens of that fall, 

 is of a dark reddish-brown colour — so much so that, were it 

 not for Dr. Balcells stating that the fresh fracture originally 

 presented the appearance of a greyish-blue sandstone, one would 

 have considered that it actually formed the connecting link be- 

 tween that stone and the meteorite of Hainholz. Its hardness 



