[ 453,1 
the mid-dream, or at all about the Barbary tide, 
which they dare not approach, on account of the 
perpetual war between thofe two people, fo as to ac- 
quire the knowledge we want ; neither are we to 
think of fuch civility from them. 
Froqs the hints and remarks I have made, why 
may not the tides in this drait be fomewhat analagous 
to the different tides daily oblerved between Portf- 
mouth and the Ide of Wight, called there tide and 
half-tide? which is, if I remember right, defcribed 
to be thus : 
That when it is high-water in the mid-chanel, ’tis 
half-ebb on one fide, and low- water on the other, (or 
elfe, when high-water on one fhore, ’tis half-ebb in 
the midd, and low-water on the other) and fo vice 
verfa change alternately. 
Whether this theory carries with it any valuable 
degree of reality or not, I hope a proper time will 
come, when it may be afcertained, by employing fit 
perfons for that purpofe. 
If on furvey it ihould turn out, what I hope, viz. 
that fuch tides there are, and that, by underdanding 
the fet and times of thefe (as yet fuppofed) dreams, a 
vedel be enabled to work in or out of the drait, with 
a contrary or light wind, ’tis enough. 
Should it fucceed, I am highly happy in moving 
it ; diould it not, I am happy dill, from the well- 
meaning. 
LXIX. At 
