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Obfervations at Bonne (called alfo Hipone) in 
Barbary. 
On that day, the weather was very changeable ; it 
rained in the afternoon ; and the wind came to the 
South- wed; : at eleven o’clock at night it became calm, 
and the lea was quiet. I was upon the terras of the 
India company’s houfe half an hour before lun-fet ; 
and we obferved, that the waters were very high % 
when all on a fudden an extraordinary current hap- 
pened ; and, in lefs than a minute, the fea-waters 
retired fwiftly, and funk ten feet and upwards ; the 
fea-thore became dry more than two hundred paces 
from its common mark, leaving the fifh upon dry 
land, numbers of which were taken up; and among 
others a kind of raii, which weighed thirty pounds. 
Three minutes after, the waters entered again with 
the fame rapidity,, with which they ran out ; and I 
obferved even till night, that thole irregular motions 
of the fea diminilhed by degrees;, and that, about 
every two minutes, the waters went in and out alter- 
nately, loling their motion infenfibly, like thofe un- 
dulations made by agitating a velfel of water, which 
gradually become lefs by turns. 
My reflections upon thefe obfervations would be 
unnecefl'ary. I Ihould however add here, what the co- 
ral- filhers told me, and made me obferve, on holding 
the co: d of the machine, which they call into the fea 
for filhing. They obferve, that there are often currents 
upon the water, which carry their boats to one fide ; 
whilfl: at the bottom of the fea, there is a contrary 
current to that upon the lurface;, and that, if they 
are not expert in making proper remarks, they often 
