452 H. S. Washington — Jerome Meteorite. 



of these reagents on the silicates, troilite, etc., would have to 

 be undertaken. The end in view would, however, seem to 

 justify such an investigation. 



The results of the several analyses are given below, the total 

 analysis being calculated from the data furnished by the others. 

 Part of the Cr 2 3 was determined as chromite — this being 

 assumed to have the simple composition FeCr,0 4 , the rest was 

 precipitated as PbCr0 4 . H 2 was determined as such in the 

 total meteorite by Penfield's method,* and referred to the 

 soluble portion. S and P 3 6 were likewise determined in the 

 total meteorite. The separation of soluble and insoluble sili- 

 cates was effected in the residue from the solution of the nickel- 

 iron by digestion on the water-bath for three hours with dilute 

 HC1 (1 : 5), and subsequent treatment with dilute KHO solu- 

 tion. The extra oxygen of the soluble portion f is that belong- 

 ing to the ferric oxide of the limonite. It was estimated by 

 calculating the amounts of olivine, augite and diopside present, 

 and deducting the amount of FeO belonging to them from the 

 total FeO. 



The specific gravity was found to be 3*466 at 15°*5 C, taken 

 with the balance, on a mass of 11 grams. The first approx- 

 imate composition is : 



Nickel-iron 4*25 



G t , , (Troilite 5*16 



Soluble | SiUcates 54 . 47 



Chromite 0*87 



Insoluble, silicateg ___ ____ 35 . 25 



100-00 



The analysis of the nickel-iron yielded : 



Fe._ 89-67 



Ni 10-01 



Co 0-32 



Cu . . _ not det. 



100-00 



The analyses of the soluble and insoluble portions, together 

 with the calculated total composition, are as follows : 



* This Journal, xlviii, 31, 1894. 



\ Total iron in this being determined as FeO. 



