METEOEITES OF NORTH AMERICA. 57 



Excluding troilite and chromite, but including phosphate, the percentage composition of the soluble and insoluble 



mixtures is as follows: 



Soluble portion. Insoluble portion. 



Si0 2 38. 26 57. 75 



Ti0 2 .18 



A1 2 3 56 4.89 



FeO 19. 52 8. 02 



NiO 09 Trace. 



MnO 27 .35 



CaO 1.03 3.44 



MgO 38. 73 23. 19 



K 2 02 .25 



Na 2 13 1. 87 



H 2 above 100° C 70 .06 



P 2 6 68 . . . . : 



CI , Trace 



99. 99 100. 00 



Whether the titanium belongs to the pyroxene or is to be credited to a special titaniferous mineral, such as ilmenite 

 for instance, the analysis does not show. The siliceous constituents of the stony matter appear from the analysis to be 

 chiefly olivine and the bronzite variety of enstatite. In order to throw further light, if possible, on the character of 

 the mineral or minerals in the soluble part, a portion of the latter was subjected to prolonged treatment with hydro- 

 chloric acid followed by dilute potassium hydroxide solution, after which an attempt was made to effect further sepa- 

 ration by the Sonnstadt solution with very limited success. The main portion thus finally obtained was analyzed. It 

 gave the following composition : 



FeO °-31] nQe . ., 



Cr 2 3 65 }0.96chrom,te. 



Si6 2 56. 48 



Ti0 2 19 



A1 2 3 2. 65 



FeO 9. 14 



NiO 



MnO 46 



CaO 2. 97 



MgO 25. 86 



K 2 18 



Na 2 1. 20 



H 2 



100. 09 

 Comparison of this with the preceding analysis of the insoluble part of the meteorite shows unquestionably that 

 its siliceous component is a mixture and that the effect of the second acid and subsequent mechanical treatment was 

 to remove partially a relatively soluble alkali-lime-alumina silicate. That this more soluble ingredient is largely 

 of feldspathic nature is, however, negatived by the fact that the last analysis, omitting chromite and titanium, affords 

 almost exactly a metasilicate ratio, and by the failure of Doctor Merrill to identify any feldspathic mineral constituent 

 in more than mere traces. 



From the data at hand the composition of the meteorite as a whole resolves itself as follows, assuming for the mixed 

 silicates in the magnetic portion the same composition as that shown by the nonmagnetic mixture: 



Nickel-iron 17. 13 



Magnetite 16 



Troilite (0.15 in magnetic, 4.90 in nonmagnetic part) 5. 05 



Soluble silicates and phosphate 37. 23 



Insoluble silicates and chromite 40. 43 



100.00 



Microscopical Discussion by Dr. George P. Merrill. 



The stone is of a gray color and granular structure, quite fine grained and friable but showing to the unaided eye 

 a finely granular groundmass studded with small spherules or chondri in sizes rarely if ever exceeding 2 mm. in greatest 

 diameter, and averaging not more than half that amount. With the pocket lens it is seen that the groundmass is also 

 largely chondritic, but interspersed with granular material and glistening metallic particles. So far as material is at 

 hand for comparison, the stone macroscopieally most resembles that of New Concord, Ohio, but is much more granular 

 and friable, as well as more pronouncedly chondritic. In the thin section under the microscope it presents no feature 

 not common to stones of its class, and various portions of its field show structures in every way similar to those of Mezo- 

 Madras, Homestead, and Dhurmsala, as figured by Tschermak, or that of San Emigdio stone as described by myself. 

 There are the usual monosomatic and polysomatic chondri, sometimes of olivine alone, enstatite alone, or olivine and 

 enstatite together, in granular or porphyritic forms with glassy base, or radiating and barred forms. The olivines not 



