258 



A. LIVERSIDGE. 



The following from Victoria is added for comparison : — 



"Reel Rain'''' Dust — Some of this dust was collected at 



Moonee Ponds near Melbourne, from a shower which fell, 



on December 27th, 1896, over Melbourne and a considerable 



area in Victoria, and was examined by Mr. T. Steel, f.c.s. 1 



He regarded it as a sample of ordinary surface soil, derived 



from the weathering of volcanic rocks ; it contained diatoms 



etc., such as are usually found in fresh water deposits. 



Dried at 110°. Moisture in air-dried sample == 6*09 



Loss on ignition 10*70 



Sand, insoluble and undetermined ... 66*23 



Alumina 15*16 



Soluble silica *75 



Ferric oxide ... ... ... ... ... 4*68 



Ferrous oxide ... ... ... ... *50 



Lime ... ... ... ... ... ... 1*36 



Sulphur trioxide — ... *62 



100*00 

 For the sake of comparison, the following analyses of 

 dusts of undoubted volcanic origin are added, it will be 

 seen at once that the atmospheric or so called meteoric 

 dust is very different in composition. Under the micro- 

 scope the differences are still more strongly marked. 



Krakatoa ashes, collected at Batavia. Analysed by A. 



Sauer (Jahrb. f. Min., 1884). 



Si0 2 63*30 



TiO, 



A1 2 3 



Fe,0 3 

 FeO 



CaO 



MgO 



MnO 



Na 2 



K 2 



Loss on ignition 



Total 



1*08 

 14*52 



5*82 



4*00 

 1*66 

 •23 

 5*14 

 1*43 

 2*17 



99*35 



1 Report of the Aust. Assoc, for Advt. Science, Sydney, 1898. 



