METERORIC DUSTS, N.S.W. 



249 



Cryoconit 



e. 









Silica 



., ... 



62*25 



Alumina 





.. 



.. 



14*93 



Iron sesquioxide 



Iron protoxide 



Manganese protoxide 



Lime 





•• 



•• 



•74 



4-64 



•07 

 5*09 



Magnesia 



Potash 





•• 



•• 



3*00 

 2*02 



Soda 





.. 



.. 



4*01 



Phosphoric acid 



Chlorine 





... 



... 



•11 



•06 



Water, hygroscopic, at 100° < 

 Water and organic matter at 



, a red heat 



... 



•34 

 2-86 



100-12 

 When long digested with strong sulphuric acid 7*73°/° dis- 

 solved and 16*46°/* when treated with strong hydrochloric 

 acid. The organic matter seems to have been mainly due 

 to the presence of various minute algae. Particles of 

 metallic iron have on several occasions been found in snow 

 collected in places where there was no possibility of the 

 iron having been derived from surrounding habitations. 



In December 1871 Nordenskjold collected some snow near 

 Stockholm after five or six days consecutive fall, which on 

 melting left a black soot-like residue containing metallic 

 particles ; to remove any possibility of doubt, Dr. Karl 

 Nordenskjold collected snow from off the ice of the Rauta- 

 jerwi on March 13th, 1872, at Evoia in Finland, 1 separated 

 by a thick forest from any houses. The residue left on 

 melting was soot-like in appearance, and under the micro- 

 scope was seen to contain black carbonaceous particles, 

 with yellowish- white granules and black magnetic grains, 

 but the quantity was insufficient to determine the presence 

 of cobalt and nickel. But snow collected by the Arctic 

 expedition on August 8th, 1872, on the drift ice in Lat. 80° N. 



1 Dr. Walter Flight, History of Meteorites., Geological Magazine, 1875, 

 p. 157. 



