*» SUPPLEMENTARY NOTE 53 



moved by scraping and liling. There was a small quantity of 

 rust in the cracks on the cut surface, but its amount was trivial. 



During the solution in aqua regia scales of schreibersite were 

 observed. A few small black grains were left which showed 

 crystal faces under the microscope, and which were identified 

 as chromite by the usual reaction. A minute amount of color- 

 less granular matter was also noted, the nature of which could 

 not be determined. 



All determinations were made in a solution of the same por- 

 tion of 3.8636 grams, the residue having been brought into so- 

 lution and added. 



The analysis gave : 



1,9318 grams 



.037 



.158 



.017 

 trace 



The separation of iron from nickel and cobalt was effected 

 by the Zimmerman method (see preceding section on the Alle- 

 gan meteorite). 



From the above data the composition of the iron may be 

 expressed as follows : 



Nickel-iron (Fe, Ni, Cu, Co) 98.31 

 Schreibersite 1.06 



Troilite .05 



Chromite trace 



Fe^Os trace 



99.42 



SUPPLEMENTARY NOTE BY DR. MERRILL. 



The structure of the Allegan stone is such as to bring up 

 prominently the question of the origin of meteorites in general. 

 It is not, how^ever, my intention to go into or review the matter 

 exhaustively, but rather to call attention to a few points here 

 illustrated that have an important bearing on the subject. 



