256 A. LIVERSIDGE. 



About 5 o'clock on Wednesday evening we had a sudden 

 and severe thunder storm with much rain and some hail; 

 the evening was clear moonlight, but during the night 

 we had several thunder showers especially towards morn- 

 ing — from early morning to about 11 a.m. there was a very 

 singular yellow coloured fog, all vegetation was sprinkled 

 with fine yellow dust, it could be easily gathered from iron 

 roofs, but it appears to have fallen before the showers of 

 rain in the morning as it had been washed into the gutters 

 of the roofing, and partially washed from the leaves, some 

 samples of which I also enclose. I have not yet been able 

 to learn how far this unusual occurrence extended." 



The foregoing part of this paper, except the quantitative 

 analyses, was written about 20 years ago, but put by pend- 

 ing the completion of the analyses ; since then other 

 samples of atmospheric dust have come into my possession 



and the results of their examination are now given. 



* * * 



Meteoric Dust from the Barrier Range near Broken 

 Hill. Collected by Mr. O. W. Lloyd in 1896. Of a reddish 

 colour, rather coarser in grain than the dusts from Men- 

 indie, Moruya, etc. The average size of the particles is 

 *07 mm. or i- -o-oths inch. It appears to be made up prin- 

 cipally of water worn quartz grains stained with iron oxide, 

 with some charcoal or carbonaceous fragments, also calcare- 

 ous particles (concretions and fragments of shells) and a 

 few black non-magnetic mineral fragments. 



Analysis. 

 Moisture at 100° 2*30 



Silica 



Iron sesquioxide 

 Alumina 



Lime 



Magnesia 



Loss on ignition 



79*10 

 2-97 



10*58 



2*00 



traces 



3*00 



99*95 



