. 1 ) _ 
part, which is lower. Of thefe the lower is found to be 
fait, but to what degree I cannot yet learn ; though the 
upper be almoft frefh. 
Arid the Lake of Title aca> being near eighty Leagues 
. in circumference, and receiving feveral confiderable frefh 
Rivers, has its Waters, by the Tcftimony of Herrera and 
Acofla, (b brackilh as not to be potable, though not ful- 
ly fo fait as that of the Ocean ; and the like they affirm 
of that of Paria , into which the Lake of Titicaca does in 
part exonerate it felf, and which l doubt not will be found 
much falter than it, if it were enquired into. 
Now 1 conceive that as all thefe Lakes do receive fi- 
vers and have no Exiteot Difcharge, fo ’twill be liece/fo- 
rythat their Waters rife' and cover the Land, until fuck 
time as their Surfaces are fufficiencly extended, fo as to ex 
hale in Vapour that Water that is poured in by the Rivers 5 
and confequently that Lakes muff be bigger or leder ac- 
cording to the Quantity of the frefh they receive. 3uc 
the Vapours thus ; exhaled are perfe&ly frelh* fo that, the 
faline Particles that are brought in by the Rivers remain be- 
hind, whilft the frefh evaporates ; and hence ’cis evident 
that the Salt in the Lakes will be continually augmented, 
and the Water grow falter and. fite. Quc in Late that 
have an Exite, as the Lake of Genefaret, otherwife called 
chat of Tiberias , and the upper Take of Mexico, and in- 
deed in moft others, the Water being continually running 
off, is fupply’d by new frefli river Water, in which the 
faline Particles are fo few as hy no means to be perceived. 
Now.if this be the true Reafbn of the Saltuefs of.thpfa 
Lakes, tis not improbable but that the Ocean it felf » 
become (alt from the lame Caufe, and we are thereby fur* 
niftied with an Argument for eflimating the Duration of 
all Things, from an Qbferva;ion ot the increment of Salt- 
nefs in their Waters, for if it be obferved what Quanti- 
ty, ojf Salt is at prelent contained in a certain W 7 eight of the 
2 , Water 
