150 Trans. Acad. Sci. of St. Lows. 
(4) That in the form of dust is probably the chief 
meteoritic augmentation to the earth’s volume, with the 
abundance of metallic grains in the desert soils and arctic 
snows as evidence. ; 
(5) That the principal ultimate source of ore materials 
is possibly meteoritic in character rather than magmatic. 
Issued December 29, 1910. 
