148 MEMOIRS NATIONAL ACADEMY OF SCIENCES, VOL. XIII. 



The metallic grains seem to be quite evenly distributed through the mass. In but one instance does a nodule 

 appear to have attained a size larger than that of a pea, and on the section of this nodule we were able to obtain the 

 Widmannstatten figures by etching. 



The rocky part, after being freed as well as possible from metal, was finally ground and digested with dilute hydro- 

 chloric acid, and the resulting soluble and insoluble portions investigated separately, but from the fact of there being 

 a number of minerals mixed together, no satisfactory conclusion could be drawn from the examination. The mass 

 was therefore analyzed as a whole with the following result: 



Si0 2 41. 92 



A1 2 3 ^ 9. 27 



FeO 22. 94 



CaO 9.09 



MgO 8. 76 



Fe 3. 75 



Ni 1. 74 



CI 0. 18=0. 32 FeCl 2 



P 0. 65 



S 1.58 



99.88 



By the analysis of the portions soluble and insoluble in dilute acid, it was found that the greater part of the lime 

 and but a trace of the magnesia had gone into solution, proving the absence of olivine, and giving grounds for the sup- 

 position that the rocky portion is mainly a mixture of anorthite and a silicate related to augite, but very rich in iron. 



It will be noticed that the ratio between iron and nickel in the metallic portion is greater than that in the rock. 

 This is accounted for by the fact that in the rocky part of the meteorite, the iron, as metal, has been greatly oxidized, 

 as is shown by the large amount of rust covering the specimens, caused no doubt by the chloride of iron present, and 

 is reckoned as FeO, accounting for the large proportion of iron in the supposed augite. 



Owing to the bad condition of the fragments subjected to analysis, we have no grounds on which to compute the 

 phosphorus and sulphur as schreibersite and troilite, but from the fact of these minerals being among the more common 

 constituents of this class of meteorites, and also that in the main analysis of the rock portion phosphorus and sulphur 

 were found, it is probable that the phosphide and sulphide of iron are two of the minerals present. 



One of the polished slices contained a nodule of about half an inch in diameter, which was sacrificed in order 

 that its nature might be determined, and the following figures give the results of analysis. The mineral was finely 

 ground, the metallic portion, if any, separated by aid of the magnet and digested in dilute hydrochloric acid. 



The insoluble portion was found to be 94 per cent, the composition of which is — 



Si0 2 51. 85 



A1 2 3 4. 52 



FeO 13. 26 



CaO 1. 09 



MgO 29. 2S 



100. 00 



Giving the ratio of R"0 to Si0 2 93:86, which corresponds well with the mineral enstatite, although in this case much 

 of magnesia is replaced by iron. The soluble portion consisted of iron with a slight trace of nickel, which tends to 

 show that the nodule contained some metallic particles which it was impossible to extract with the magnet. During 

 the digestion in acid, as no sulphuretted hydrogen could be detected, we infer the nonexistence of sulphides in the 

 nodule. 



The total mineral was also analyzed with the following results: 



Si0 2 49. 96 



A1 2 3 4. 75 



FeO 15. 97 



CoO+NiO Trace. 



CaO 1.15 



MgO 28. 15 



99.98 



This meteorite is a lithosiderite poor in metal, the metallic portion not exceeding 16 per cent of the mass. The 

 stony part is probably anorthite and enstatite. 



