METEORITES OF NORTH AMERICA. 101 



methods could they be satisfactorily separated. An attempt to separate the light coaly matter by the use of the Thoulet 

 solution was only partially successful, as a small amount of the black particles were carried down with the heavy 

 metallic grains and a larger portion of these were retained by the spongy, coaly particles. The proportions given 

 below, calculated for the dissolved portion after deducting the nucleal piece and vein matter, are therefore only approxi- 

 mate: 



Grains. Per cent. 



Original specimen 195. 



Large jagged nucleal piece 9.1855 



Vein matter, schreibereite and cohenite 2. 971 



Small jagged pieces 1.4105 0.78 



Tsenite 1.872 1.02 



Coarse schreibersite and cohenite 7.5835 4.14 



Fine magnetic residue mainly schreiberaite, in part acicular . 



(rhabdite), with some teenite and cohenite 1.4945 0.82 



Fine nonmagnetic residue with rhabdite 0. 517 0. 28 



Dissolved.. . 169.966 92.95 



100.00 



An analysis of 100 cc. of the solution corresponding approximately to 0.5 grams of the meteorite (except for the 

 copper determination which was made with 500 cc.) gave: 



Fe NiCo P Cu 



91.264 9.252 0.44 0.44 =100.00 



This result agrees fairly well with the composition of kamacite (Fe 93.11, Ni, Co 6.89) according to the formula 

 Fe, 4 Ni as given by Cohen. As the proportion of phosphorus and copper is higher than in the greater part of Cohen's 

 analyses in which for the most part weaker acid was employed, it may be presumed that the elements rich in nickel, 

 tanite, schreibersite, and the coaly substance were more strongly attacked, giving an enrichment in nickel. Making 

 allowance for this circumstance, the dissolved portion may be considered as consisting essentially of normal kamacite. 



A large jagged piece which was only attacked with extreme slowness by cold acid of a strength of 1 to 10 was tried 

 with acid 1 in 5 without much better results in the cold. Upon heating on the water bath vigorous action commenced 

 and continued even after the acid was much diluted. At times the action would continue in the cold after removal 

 from the bath, at others it would almost cease in the hot acid and only recommence with vigor on the addition of a 

 considerable quantity of fresh acid . At other times the action would continue until the acid was completely exhausted 

 and a precipitate began to appear in the solution. These variations in the action of the acid indicate a lack of homo- 

 geneity and varying degrees of solubility in different parts of the mass. The residue was similar to that of the original 

 mass except that cohenite was almost entirely lacking. The principal contrast in the two residues was in the greater 

 relative abundance of rhabdite and the less abundance of granular schreiberaite and the coaly matter in that of the 

 jagged piece. The coaly matter was evidently partially destroyed by the action of the hot acid and the residue was 

 entirely freed from it by treatment with strong cold acid, a white, flocculent skeleton remaining. 



The large piece was broken up as follows: 



Grams. Percent. 



Original specimen 9. 1855 



Taenite 0.029 0.31 



Schreibersite (granular 0.0075 grams, 0.08#; acicular 0.0255 



grams,0.27#) 0.033 0.35 



Nonmagnetic residue 0. 325 0. 34 



Dissolved.. . 9.094 99.00 



100.00 



An analysis of the solution gave the following result (copper was determined in the whole solution, the other 

 elements in 100 c. c.): 



Fe NiCo P Cu 



94.32 5.78 0.15 0.05 =100,30 



This composition agrees very nearly with that of the "zactige Sttiee" of Toluca given by Cohen, and, like that, 

 shows a higher proportion of iron and a lower proportion of nickel and cobalt than the general mass of the meteorite and 

 of normal kamacite. The occurrence of rhabdite is not noted in the case of Toluca but may perhaps be presumed 

 from the relatively high percentage of phosphorus. 



The nonmagnetic residue consisted mainly of rust particles and some dirt, evidently derived from laboratory 

 dust. Nothing of any interest that could be referred to the meteorite could be detected in it by microscopic examination. 



The email jagged pieces were dissolved in copper-ammonium chloride with the view of determining the amount 

 of carbon, but owing to an accident this determination was lost, and only the relative proportion of granular (1.84 %) 

 and of acicular (1.16$ ) schreibersite was determined. The amount of the coaly residue was apparently greater than 

 in the treatment with acid. The higher proportion of schreibersite may be referred in part to the slighter action of 



