342 NEWTON COUNTY (ARK.) METEORITE. 



There was a minute quantity of the manganese estimated 

 with the oxide of iron and magnesia. This analysis overruns 

 the 100. This is accounted for in part by the quantity used for 

 analysis not being more than 0.160 grammes. The oxygen ratio 

 of the silica and protoxides show the composition &3 Si, which is 

 that of olivine. 



Carbonate of Lime. — The observation of this constituent in 

 a meteorite is something entirely new, yet it is found on the 

 exterior surface of the meteorite in question in various places. 

 There is no doubt in my mind, however, that this ingredient 

 was not a part of the mass when it fell; but that it has been 

 exposed to certain conditions since its fall by which carbonate 

 of lime has been incrusted on its surface. 



It is much to be regretted that the entire original mass is 

 not accessible to furnish facilities for determining whether it 

 is an incrustation or not, and if the former, whether the incrus- 

 tation was formed prior or subsequent to its fall. 



In relation to the presence of carbonates in meteorites we 

 have the first and only announcement, up to the present time, 

 in connection with the meteorites which fell at Orgueil in 

 1863. Messrs. Des Cloizeaux, Pisani, Daubree, and CLoez dis- 

 covered minute rhombohedral crystals of double carbonates of 

 magnesia and iron. 



The above statements exhaust about all that I have to say at 

 the present time on the meteorite under investigation. There 

 may be one or two other minerals in its composition, but I 

 could not separate them in a manner to pronounce as to whether 

 they were different from those already described or not. 



