(| 5 ) 
about it, that there is yet another irregularity in the Tides, 
which never fails, and isnolefs extraordinary, than what l 
have been mentioning : which is, 1 hat, whereas between the 
Vernal and Autumnal Equinoxes, that is, for fix Moneths toge* 
ther, the Courfe of irregular Tides about the Quartermoons , 
is, to run all day, that is, twelve hours, as from about ci to 
io^to iCj&e. Eaflward, and all night, that is, twelve hours 
more. Weft ward : during the other fix Moneths, from the Au~ 
tumnal to the Vernal Equinox, the Current runs all day Wefirvard, 
and all Idiight Eaftvard. 
Of this, though I had not the opportunity to be an Eye- wit- 
nefs, as of the other, yet Ido not at all doubt, having received 
To credible Information of it. 
To penetrate into the Caufes of thefe ftrange Reciprocations 
of the Tides, would require exadt defcriptions of the Situation, 
Shape 3 and;Extent of every piece of the adjacent Coafts of Eufl 
and Herris s the Rocks, Sands, Shelves, Promontory*, Bays, 
Lakes, Depths 5 and other Circumftances, which I cannot now 
fet down with any certainty^ or accuratenefs - feeing, they are 
to be found in no Map , neither had I any opportunity to iur- 
vey them $ nor do they now occur to my Memory, as they did 
forne years 2 go 3 when upon occafion I ventured to make a 
Map of this whole Frith oC Berner ay, which not having copied,, 
I cannot adventure to b^at it out again. 
Monfieur Auzout’x Judgment touching the A- 
perturer of Objed-Glafles, and their Pro- 
portions, in rejpeB of the fever al Lengths of 
T elefcop €S. 
This Author, obfervingina fmall FtenehTraB lately written 
by him to a Countryman of his, Monfieur L' Abbe Charles $ 
That great OpticJ^Glafies have almoU never as great an Aperture 
as the fmall ones, in proportion to what they Magoifie, and that 
therefore they muff be more dim ; takes occafion to inform* 
H. 2 the- 
