(^0 
about it, that there is yet another irregularity in the Tides, 
which never fails, and isnolcfs extraordinary, than what I 
have been mentioning : which is^ Ihat^ whereas between the 
Vernal and Autumnal Equinoxes^ that is, for fix Moneths toge* 
thcr, the Coiirfe of irregular Tides about the Quartcrmoons , 
iSj to run all day, that is, twelve hours, as from about ci to p-^, 
lO^to lO-^ ^ c, Eajlward, and all nighty that is, twelve hours 
more, fFeJlward: during the other fix Moneths, from the Au* 
tumnalto the Fernal Equmox^ the Current runs all day Wejlvcard, 
and all Night Eafiivard, 
Of this, though I had not the opportunity to be an Eycivit- 
nefs, as of the ocher^yet I do not at all doubr, having received 
fo credible Information of it. 
To penetrate into the Causes of thefe ftrange Reciprocations 
of the Tides, would require exad: dcfcriptions of the Situation, 
ShapCjand Extent of every piece of the adjacent Coafts of Eujl 
andHerris > the Rocks, Sands, Shelves^ Promontorys, Bays, 
Lakes, Depthsj and other Circumftances^ which I cannot no¥/ 
fet down with any certainty^ or accuratenefs • feeing, they arc 
to be found in no M^p, neither had I any opportunity to fur- 
veythem, nor do they now occur to my Memory, astb@y did 
fome years ago, when upon occafion I ventured to make a 
Map of this whole Friih of Berneray, which not having copied, 
I cannot adventure to beat it out again. 
Monfieur Auzout V Judgment touching the A- 
ferlnref of Ob/ed-Glafles^ and their Pro- 
portions^ in refpB of the fever al Lengths of 
Telefcopes. 
This Author, obferving in a fmall Ffench TraU lately written 
by him to a Countryman of his, Monfieur L Abbe Charles > 
That great Optich^ Glares have almoft never as great an Aperture 
as the fmall ones, in proportion to what they Magnifie, and that 
therefore they muft be more dim^' takes occafion to inform 
H 2. the- 
