596 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



any other available for comparison in the national collections. 

 According to the figures given by Brezina and Cohen/ howev^er, it 

 would seem to more closely resemble the Cowra iron. The plessite 

 areas are veiy poorly developed, and in places wholly indistinguishable 

 or quite lacking. Troilite occure in the usual rounded nodules, the 

 remainders of two larger forms showing at the top and bottom of 

 figure 1, plate 45, and a smaller one at the innnediate left of figure 2. 

 The metal, it is well to note, is very tough and hard and can not be 

 cut at all by the ordinaiy hacksaw used by metallurgists. 



In connection with investigations on the minor constituents of 

 meteorites carried on under a grant from the National Academy of 

 Sciences it was possible to make a very thorough analysis of the iron, 

 the analytical work being done under the supervision of Dr. J. E. 

 Whitfield. These results are given in column 1 below. In column 2 

 is given the average of two analyses of the Ballinoo iron by Sjostrom ^ 

 and Mariner and Hoskins.^ 



(1) (2) 



Per cent. Per cent. 



Iron (Fe) 89. 015 89. 625 



Nickel(Ni) 9.660 9,86 



Cobalt(Co) 545 .67 



Copper 025 .03 



Manganese None. .... 



Phosphorus 365 .49 



Sulphur 002 .03 



Silicon 003 Trace, 



Carbon 015 ,02 



Ferric oxide 370 



Iridium Trace. 



Palladium Trace. 



Platinum Trace. 



Ruthenium Trace. 



100. 00 100. 725 



Specific gravity 7.61, Determined in picnometer flask at 22.4° C. 

 and on chips showing no visible troilite. 



The amounts of the rarer elements found in different samples of 

 the iron were quite variable though always small. In one portion of 

 25 grams was found 0,004 gram of platinum, and in another of 100 

 grams but 0,002 gram. The precipitates of ammonium platinum 

 cliloride were in all cases colored faintly orange, indicating the pres- 

 ence of palladium, but in amounts too small for determination. In 

 another 100-gram portibn of the iron was found 0,014 gi*am of ruthe- 

 nium and 0,028 gram of iridium, while yet another portion of equal 

 weight yielded 0,0009 gram of ruthenium and 0,0011 gram of 



1 Die Struktur u. Zusammensetzung der Mcteoreison, pi. 29. 



2 Sitz. (ler k. Preus. Akart. Wiss., Borlin, Jan.-June, 1908, p. 21. 



3 Amer. Jouin. Sci., vol. 5, LS98, p. 137. 



