In that Tract of _Isles_, on the West of _Scotland_, called by the Inhabitants, the _Long-Island_, as being about 100. miles long from _North_ to _South_, there is a multitude of small Islands, situated in a _Fretum_, or _Frith_, that passes between the Island of _Eust_, and the _Herris_; amongst which, there is one called _Berneray_, some three miles long, and {54} more than a mile broad, the length running from _East_ to _West_, as the _Frith_ lyes. At the _East_ end of this _Island_, where I stayed some 16. or 17. dayes, I _observed_ a very strange Reciprocation of the Flux and Re-flux of the Sea, and _heard_ of another, no less remarkable. Upon the _West_ side of the _Long Island_, the Tides, which came from the _South-west_, run along the Coast, _Northward_; so that during the ordinary course of the Tides, the Flood runs _East_ in the _Frith_, where _Berneray_ lyes, and the Ebb _West_. And thus the Sea ebbs and flows orderly, some 4. days before the _full Moon_, and _change_, and as long after (the ordinary Spring-tides rising some 14. or 15. foot upright, and all the rest proportionably, as in other places). But afterwards, some 4. days before the _Quarter-moons_, and as long after, there is constantly a great and singular _variation_. For _then_, (a _Southerly_ Moon making there the full Sea) the course of the Tide being _Eastward_, when it begins to flow, which is about 91/2 of the Clock, not onely continues so till about 31/2 in the afternoon, that it be high water, but, after it begins to ebb, the Current runs on still _Eastward_, during the whole Ebb; so that it runs _Eastward_ 12 hours together, that is, all day long, from about 91/2 in the morning, til about 91/2 at night. But then, when the night-Tide begins to flow, the Current turns, and runs _Westward_ all night, during both Floud & Ebb, for some 12. hours more, as it did _Eastward_ the day before. And thus the Reciprocations continue, one Floud and Ebb, running 12 hours _Eastward_, and another twelve hours _Westward_, till 4. days before the _New_ and _Full_ Moon; and then they resume their ordinary regular course as before, running _East_, during the six hours of Floud, and _West_, during the six of Ebb. And this I observed curiously, during my abode upon the place, which was in the Moneth of _August_, as I remember.