AX. Tjniv. QrAK., Vol.. IX, J^eries A. 



PLATE XIA'III. 





Ki^. :.. Arsrni.. fn.n, ,-lMMni...l Inhnn.tory X 75. Mos.ly r.ystallin.. parlWles. 



Fis. .;. .\i-sonic from pl.armury Uiboratory X 75. Mostly amorphous particles. 



