276 A. LIVERSIDGE. 



whole planet to a height certainly of about three miles, 

 and probably to a height even greater. The meteorites 

 which are consumed at an average height of 20 to 40 miles 

 must add something to this." 



E. Metzger, in a letter to "Nature," 17/1/1884, p. 261, 

 draws attention to the presence of particles attracted by 

 the magnet in the sand dunes near Scheveningen. 



Some atmospheric dust collected at Klagenfurt,Oarinthia, 

 after a rain of mud, which had taken place on Oct. 14th, 



1885, was found to consist of minute crystalline granules 

 and flakes of quartz, opal, orthoclase, biotite, phlogopite, 

 pyroxene, amphibole, mica, talc, kaolin, chlorite, rutile, 

 anatase, zircon, tourmaline, ferruginous clay, spinel, mag- 

 netite, pyrites, magnetic pyrites, calcite, magnesite, dolo- 

 mite, and apatite ; metallic iron could not be found. Diatoms 

 etc., were present, together with a few carbonaceous or 

 carbonized substances, such as the spores of fungi, filaments 

 of algae etc., silicifled membranes of parenchymal cellules, 

 and pyritised and silicifled spherules resembling pollen. 

 Its reddish yellow colour, resembling the "Passat" dust, 

 may be against its having come direct from the Sahara. 1 



In an address delivered to the Royal Meteorological 

 Society, Jan. 15th, 1890, Dr. William Marcet, p.r.s., 

 President, quotes from a paper by Dr. Cook in the Journ. 

 Roy. Meteorological Society, who says that in India there 

 are some days on which however hard and violently the 

 wind may blow, little or no dust accompanies it, while on 

 others every little puff of air or current of wind forms or 

 carries off with it clouds of dust. If the wind which raises 

 the dust is strong, nothing will be visible at the distance 

 of a few yards, the sun at noon being obscured. The dust 



1 Dr. M. Schuster, Imp. Acad. Vienna, Jan. 14, 1886; and Geol. Mag. 



1886, p. 122. 



