224 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



minerals crystallizing freely from a molten magma, but is suggestive of a partial recrystallization of fine detrital 

 material, as seen in sundry metamorphic schists. The same feature is shown in the fine interstitial portions of another 

 figure of the same plate. It is practically impossible to cut sections thin enough to enable one to write as definitely 

 as desirable, but the structure in both these cases is strongly suggestive of that seen in the meteorite of Keraouve, 

 France, and which F. Rinne, following Tschermak, regards as due to a mechanical trituration and resintering from a 

 subsequent elevation of temperature. 



The chemical composition of the stone, as worked out by Mr. Tassin, is as follows: 



The portion taken for analysis was badly oxidized. It was therefore kept for sometime at a temperature below 

 red heat in an atmosphere of hydrogen. 



The nickel iron was determined in a portion of the mass weighing 2.100 grams. This was pulverized and treated 

 with a solution of mercuric ammonium chloride (12 grams of the double salt, HgCl 2 .2NH 4 C1.2H 2 O, to the liter) in an 

 atmosphere of hydrogen. The native metals thus separated were in the following proportions: 



Found (per cent). Calculated to 100. 



Fe 2.37 91.51 



Ni 0.21 8.11 



Co 0.01 0.38 



The sulphur was determined in a 1.01-gram sample after fusion with sodium carbonate and potassium nitrite. 

 The amount found was 1.61 per cent, which corresponds to 4.43 per cent of troilite. The phosphorus iras determined 

 in d 1.5235-gram sample, and 0.012 per cent was found, which corresponds to 0.08 per cent of schreibersite. 



The separation of the silicates was effected in a 2.63-gram fragment by treating the finely pulverized mass with 

 dilute hydrochloric acid, specific gravity 1.06, on the water bath for two hours, repeating this operation twice, fol- 

 lowed by boiling the moist residue of undecomposed silicate with a solution of sodium carbonate, since the major part 

 of the silica of the soluble silicate will be here found. 

 The analysis of the soluble silicate gave: 



. Found (per cent). Calculated to 100. 



SiO 2 15.66 38.34 



FeO 9.44 23.10 



A1 2 3 0.20 0.49 



Cr 2 3 0.03 0.07 



CaO 0.15 0.36 



MgO 15.38 37.46 



3L 86 100. 00 



The insoluble silicates, analysis below, were decomposed by fusion with sodium carbonate. The alkalies were 

 determined in a separate portion. 



Found (per cent). Calculated to 100. 



SiO 2 30.40 56.01 



FeO 4.89 9.01 



ALj0 3 2.00 3.68 



Cr 3 3 0.20 0.37 



CaO L98 3.65 



MgO 13.24 2439 



KjO 0.10 0.18 



Na 2 0. 96 L 77 



Chromite 0.51 0.94 



54. 28 100. 00 



The general composition of the meteorite may be arrived at by combining the results of the several determinations 

 thus: 



Fe 2.37 



Ni a 21 



Co 0.01 



S L61 



P a 012 



Si0 2 46. 06 



FeO . 14.33 



ALA 2. 20- 



Cr 2 3 a 23 



CaO 2. 13 



MgO 28.62 



a 10 



0. 96 



Residue (chromite) 0. 51 



99.352 



