1of which is (as hath often been ſaid) the determinate
tion and retardation of the parts of the Earth, from whence
the Waters have a determinate period put to their decurſions
towards the Eaſt, and return towards the Weſt, in the time of
twenty ſour hours. The other is that which dependeth on the
per gravity of the Water, which being once commoved by the
primary cauſe, ſeeketh, in the next place, to reduce it ſelf to
quilibrium, with iterated reciprocations; which are not
mined by one ſole and prefixed time; but have as many
ties of times as are the different lengths and profundities of the
receptacles, and Straights of Seas; and by what dependeth on
this ſecond principle, they would ebbe. and flow, ſome in one
hour, others in two, in four, in ſix, in eight, in ten, &c. Now if
we begin to put together the firſt cauſe, which hath its ſet Period
from twelve hours to twelve hours, with ſome one of the
dary, that hath its Period verb. grat. from five hours to five
hours, it would come to paſſe, that at ſometimes the primary
cauſe and ſecondary would accord to make impulſes both one
and the ſame way; and in this concurrency, and (as one may call
it) unanimous conſpiration the flowings ſhall be great. At other
times it happening that the primary impulſe doth, in a certain
manner, oppoſe that which the ſecondary Period would make,
and in this conteſt one of the Principles being taken away, that
which the other would give, will weaken the commotion of the
Waters, and the Sea will return to a very tranquil State, and
almoſt immoveable. And at other times, according as the two
aforeſaid Principles ſhall neither altogether conteſt, nor
ther concur, there ſhall be other kinds of alterations made in
the increaſe and diminution of the ebbing and flowing. It may
likewiſe fall out that two Seas, conſiderably great and which
communicate by ſome narrow Channel, may chance to have, by
reaſon of the mixtion of the two Principles of motion, one
cauſe to flow at the time that the other hath cauſe to move a
contrary way; in which caſe in the Channel, whereby they
imbogue themſelves into each other, there do extraordinary
conturbations inſue, with oppoſite and vortick motions, and
moſt dangerous boilings and breakings, as frequent relations
and experiences do aſſure us. From ſuch like diſcordant
ons, dependent not onely on the differenr poſitions and
tudes, but very much alſo upon the different profundities of the
Seas, which have the ſaid intercourſe there do happen at
times different commotions in the Waters, irregular, and that
can be reduced to no rules of obſervation, the reaſons of which
have much troubled, and alwayes do trouble Mariners, for that
they meet with them without ſeeing either impulſe of winds, or
tion and retardation of the parts of the Earth, from whence
the Waters have a determinate period put to their decurſions
towards the Eaſt, and return towards the Weſt, in the time of
twenty ſour hours. The other is that which dependeth on the
per gravity of the Water, which being once commoved by the
primary cauſe, ſeeketh, in the next place, to reduce it ſelf to
quilibrium, with iterated reciprocations; which are not
mined by one ſole and prefixed time; but have as many
ties of times as are the different lengths and profundities of the
receptacles, and Straights of Seas; and by what dependeth on
this ſecond principle, they would ebbe. and flow, ſome in one
hour, others in two, in four, in ſix, in eight, in ten, &c. Now if
we begin to put together the firſt cauſe, which hath its ſet Period
from twelve hours to twelve hours, with ſome one of the
dary, that hath its Period verb. grat. from five hours to five
hours, it would come to paſſe, that at ſometimes the primary
cauſe and ſecondary would accord to make impulſes both one
and the ſame way; and in this concurrency, and (as one may call
it) unanimous conſpiration the flowings ſhall be great. At other
times it happening that the primary impulſe doth, in a certain
manner, oppoſe that which the ſecondary Period would make,
and in this conteſt one of the Principles being taken away, that
which the other would give, will weaken the commotion of the
Waters, and the Sea will return to a very tranquil State, and
almoſt immoveable. And at other times, according as the two
aforeſaid Principles ſhall neither altogether conteſt, nor
ther concur, there ſhall be other kinds of alterations made in
the increaſe and diminution of the ebbing and flowing. It may
likewiſe fall out that two Seas, conſiderably great and which
communicate by ſome narrow Channel, may chance to have, by
reaſon of the mixtion of the two Principles of motion, one
cauſe to flow at the time that the other hath cauſe to move a
contrary way; in which caſe in the Channel, whereby they
imbogue themſelves into each other, there do extraordinary
conturbations inſue, with oppoſite and vortick motions, and
moſt dangerous boilings and breakings, as frequent relations
and experiences do aſſure us. From ſuch like diſcordant
ons, dependent not onely on the differenr poſitions and
tudes, but very much alſo upon the different profundities of the
Seas, which have the ſaid intercourſe there do happen at
times different commotions in the Waters, irregular, and that
can be reduced to no rules of obſervation, the reaſons of which
have much troubled, and alwayes do trouble Mariners, for that
they meet with them without ſeeing either impulſe of winds, or