8

*(4) Proceedings of the Geolog. Soc. vol. IV. p. 145. The dust described by the author Rev. W. Clarke fell between Feb 2d to the 4th 1839, when between (Lat. 21° 14' N. Long 25° 6' W) and nearly (Lat. 12° 36' N. Long. 24° 13' W) (A) The author Mr. Clarke has since written a communication on the subject for the Tasmanian Journal (vol. I. p. 321) to which I am indebted for two references.

*(5) Nautical Magazine, 1838, p. 824.

*(6) Nautical Magazine, 1837, p. 291.5 Mr. Burnett in sailing from (Lat. 4° 20' N. long. 23° 20' W) to (Lat. 8° N Long 27° 20' W) a distance of 300 miles, with the wind N.E., after a S.E. squall horizon hardly visible, had the sails, rigging & mast covered with red dust. The nearest land was 600 miles distant. The same phænomenon was observed by Mr. Burnett in 1836.

Mr. Forbes gives an account (Sharon's S. Hist of the world) p. 149) of dust which fell on a ship when 600 miles from the coast of Africa between C. Verd & the R. Gambia: the wind all the previous night had been N.E.)

(In the Eding New Phil. Journal (1822 vol. 7. p. 402) there is another account of dust which fell in considerable quantities on March 29th, 1821, in Lat. 11° 3' N. when 300 miles from the nearest part of Africa.)

In Malcolm Howard Malcolm's Travels (vol. II. p. 200) there is a similar account of dust which fell in during several days in February on a ship north of the equator, when more than

[8v]

(A)

The direction of the wind has been already given in the Paper; as it also has been, in when the dust, collected by Lieut. James and myself, fell.