Dr. Walter Flight — History of Meteorites. 407 



The slight excess of iron oxide found in each case is doubtless due 

 to the presence of a little unseparated nickel-iron. These results 

 confirm the above analysis and fail to indicate the presence of olivine 

 in this meteorite. 



Found 1850. — Ruff's Mountain, Lexington Co., S. Carolina. 1 



In an examination of this large block of meteoric iron Shepard 

 detected the presence of only 3 '12 per cent, of nickel. By employing 

 two more refined methods of analysis, Eammelsberg now finds : 



I. II. Mean. 



Nickel 7-60 9-65 8"62 



which is still within the limit that I find to obtain in those instances 

 where an iron exhibits Widmannstattian figures. (Compare with the 

 list on page 80.) 



1852, September 4th. — Mezo-Madaraz, Transylvania. 2 



Allusion has already been made to Kammelsberg's recent investi- 

 gation of this meteorite (see page 25). His previous researches on 

 the constitution of the meteorites of Kleinwenden, Pultusk, Rich- 

 mond, and Linn Co., Iowa, 3 had proved them to consist of a mixture 

 of olivine and bronzite, and in his review of the additions made 

 during the last few years to our knowledge of these cosmical masses, 4 

 he had demonstrated that of the fifty chondritic meteorites which had 

 up to that time been submitted to analysis, the greater part 

 yielded a like result. Certain among the meteorites, however, did not 

 appear to come under this rule ; among them is the one mentioned 

 above which had been analysed by Atkinson, 5 who found no ii'on 

 protoxide in the insoluble portion, and determined the part broken 

 up by the acid to be a trisilicate. The author was led to analyse 

 this stone afresh, and he has arrived at the following results : 

 Nickel-iron 9-79 



Troilite 



6-24 



Ckromite 



0-80 



Soluble silicate 



4283 



Insoluble silicate 



40-34 



100-00 

 The nickel-iron, which has the composition indicated by the 

 formula Fe 5 Ni, yielded the following numbers : 



Iron = 83-25 ; Nickel (cobalt) = 16-75. Total 100-00 

 and the silicates those given below : 



Si0 2 A1 2 3 FeO MnO 



A. Soluble 36-61 2-19 22-82 0-42 



B. Insoluble 52-02 6-08 13-27 — 



C. Total 44-24 4-10 18-25 0-22 



1 C. Eammelsberg. Monatsber. Ak. Wiss. Berlin, 1870, lxx. 444. 



2 C. Eammelsberg. Zeitselirift Deutsch. Geol. Gesell. Berlin, 1871, xxiii. 734. 



3 C. Eammelsberg. Monatsber. Ak. Wiss. Berlin, 1870, lxx. 440. 



4 C. Eammelsberg. Die Chemische Natur der Meteoriten. Abhandl. Ak. Wiss. 

 Berlin, 1870, 75. 



5 E. Atkinson. Jour. Prakt. Chem., 1856, 357; Thil. Mag., xi. 141. 



NiO 



MgO 



CaO 



Na 2 





014 



35-49 



0-60 



1-02 



= 99-29 



— 



21-85 



3-74 



3-28 



= 100-24 



0-07 



28-98 



2-02 



2-12 



= 100-00 



