METEORIC DUSTS, N.S.W. 



259 



Volcanic Dust from Mount Pelee, Martinque, collected 

 from the deck of the s.s. " Roddam" the only ship which 

 escaped from St. Pierre. 1 Dried at 105° : 



Silica 53*40 



Alumina 



Iron sesquioxide 



Lime 



Magnesia 



Na 2 



K 2 



S0 3 



P 2 5 



21*00 



9-50 



9*70 



2*00 



2*33 



•85 



•90 



*25 



99*93 



Volcanic Dust, Barbadoes. 2 From the recent eruption, 

 the ash consists principally of a plagioclase felspar allied to 

 labradorite, hypersthene, monoclinic augite and magnetite. 

 The following analysis was made by Dr. Pollard. 



SiO, 



... 52*81 



MgO 



5*19 



Ti0 2 



•95 



K 2 



•60 



A1 2 3 



... 18*79 



Na 2 



3*23 



Fe 2 3 



... 3*28 



p 2 o 5 



•15 



FeO 



... 4*58 



S0 3 



•33 



NnO 



•28 



01 



•14 



(OoNi)O ... 



•07 



H 2 (105°) 



•20 



OaO 



... 9*58 



H 2 (above 105) 



•17 



100*35 



The following hitherto unpublished accounts of falls of 

 meteoric dust and dust fogs in New South Wales are, 

 except the first, selected from a large number kindly placed 

 at my disposal by Mr. H. O. Russell, b.a., c.m.g., f.r.s., 

 Oovernment Astronomer ; they are of interest as showing 

 the conditions under which some of the dusts were 

 deposited. 



1 Chemical News, June 13, 1902. 



2 Geol. Soc, May 25, 1902. " Nature," 5th June, 1902. 



