The Water of this Lake is very good to drink, and ever so limpid, that even in the rolling of the Waves, which sometimes go high enough, the Water is not troubled but along the Banks. And if one do attentively look down from the Castle of _Chilon_ or from any of the neighbouring heights into the bottom of the Lake, he may see high Mountains under the Water. And the Water is so Deep before _Veuvay_, that the sounding Line at the end of four hundred Fathoms seems, because it will not stay, to Touch upon something slippery. 'Tis held to be 500 Fathoms deep before _Roole_; and 'tis affirm'd, that near this great Depth there may be seen a kind of _Isle_ under Water. The _Rhone_ enters at one of the Points of the Croissant into the Lake, and issueth out at the other; but with this Difference, that whereas he comes in Dirty and Miry, he ever goes out so Pure and Clear, that under the Bridge of _Geneva_, where the Water is deep twenty five Feet in Summer, you may well discern the smallest Stones at the bottom. And the same Water, which in this Place appears of a Saphyring Blew in the shade of the Houses, appears altogether Green, nor is so Transparent, when the Sun shines on it. There is a great diversity of Opinions as to the _Current_ of the _Rhone_ in the Lake; some maintaining, that it may be discerned, others denying it. Having heard the Sentiments of the Curious of _Lausanne_ and _Geneva_, and the Opinions of the most knowing Fishermen that are there in great Number, and especially at _Coupet_, I believe with the latter; that, although the _Rhone_ entring into the Lake loseth its Violence, yet doth he still keep some sensible Motion in some places, and every were observable, and that no Trouts are taken any were in this Lake, but in this Current of the _Rhone_; which is what these Fishermen call, to go and Fish _sur le mont_. Others there are, that go further and say, that one may every where distinguish the Water of the Lake from that of the _Rhone_: But the Fishermen will not allow this, but assert, that there is no other Mark than those lately alledged, _viz._ of the Trouts, and the Current; and that the latter of these is alone sufficient, in calm Weather, to observe the Current of the _Rhone_ from the place of his entring the Lake unto that of his going out. The Water of this Lake commonly begins to Increase about the end of _January_, or the beginning of _February_, and continues to do so unto the twentieth of _July_, and often unto the very Month of _August_; and then it insensibly decreaseth, so that the Water is less high in Winter than Summer by twelve or fifteen Feet; the Frosts draining the Springs, or rather Freezing the Waters that issue out of them.