io Mijcellanea Curiofa. 



the Moon is vertical, and mart eft where flie i 3 

 in the Horizon ; and that the Moon fhifting her 

 Pofuion as ihe turns round the Earth once a 

 Day, this Oval of Water fhifts with her, occa- 

 fioning thereby the two Floods and Ebbs obfer- 

 vable in each 25 Hours. 



And this may fuffice, as to the general Caufe of 

 the Tides , it remains now to fhew how natu- 

 rally this Motion accounts for all the Particulars 

 that have, been obferv'd about them ; fb that 

 there can be no room left to doubt, but that this 

 is the true caufe thereof. 



The Spring Tides upon the New and Full 

 Moons, and Neap Tides on the Quarters, are 

 occafion'd by the attractive Force of the Sun in 

 the New and Full, confpiring with the Attracti- 

 on of the Moon, and producing a Tide by their 

 united Forces : Whereas in the Quarters, the 

 Sun raifes the Water where the Moon deprelfes it, 

 and the contrary ; fb as the Tides are made only 

 by the difference of their Attractions. That the 

 force of the Sun is no greater in this Ca^, pro- 

 ceeds from the very fmall Proportion the Semi- 

 diameter of the Earth bears to the vail: diftance 

 of the Sun. 7i 



It is alfo obferv'd, that extern paribus, the 

 ^Equinoctial Spring Tides in March and Sep' 

 tember 9 or near them, are the Higheft, and the 

 Neap Tides the lowed ; which proceeds from 

 the greater Agitations of the Waters, when the 

 fluid Spheroid revolves about a great s Circle of 

 the Earth, than when it turns about in a lefler 

 Circle ; it being plain? that if the Moon were 

 conftituted in the Pole, and there ftocd, that the 

 Spheroid would have a fix'd Pofition, and that it 

 would be always high Water under the Poles, 

 and low Water every where under the /Equi- 

 noctial : 



