4S4 Mr. schotte’s Journal of the 
fame month in the river Gambia was not hotter than any 
other wind, owing in all appearance to the difference of 
the foil of the country, which is not fandy like that of 
Senegal. I think it is the dull of the fand raifed by this 
wind which makes the atmofphere look hazy. I myfelf 
faw in the year 1775, in the month of April, in a morn- 
ing preceded by an Eafterly wind, fuch a duft imitating 
a fog in the air, that one could not fee above twenty 
yards. 
The weather grew calm, and about eleven o’clock in 
the forenoon the atmofphere grew clear by depofiting a 
brownifh impalpable duft, which covered every thing 
near a line in thicknefs. The fame thing I obferved 
at fea from on board of a veffel in the month of 
March 1775, at the diftance of about five or fix 
leagues from the land near the latitude of Senegal. 
The wind having blown Eaft in the night, I found in 
the morning the fails, fhrouds, and deck, covered with 
an impalpable duft. The description given by the 
learned Dr. lind <a> of the Harmattans of the Coaft of 
Guinea, feems to agree with the Eaft wind at Senegal in 
almoft every refpedf, except that the damp vapour in the 
former is not perceptible in this, for it dries every thing 
that will admit of it. Water poured on the floor of a 
(a) Efiay on the molt effectual Means of prcferving the Health of Seamen. 
room i 
