THAN S A GTIQNS, 
The C O N T E N T S. • 
Aft Account eftke ^Hrrepst of tke 'tydej hku^'th Orcades. A Con- 
iimathn of the Letters exchanged between Moffjieur Slufius af2d 
Monjteur B^wgtmm.concerning the Of tic Problem of AWnztnycttf 
conrfed of i^ Numb.^j. A Letter of Dr Jphn "^^iB^ffjeriing to 
William Neile Efqmre^ thefirfi Invention and DemGnjimtion of 
the Equalit) of theCurve Ime of a Paraboloeid /d? a Sireight Une- 
And mxt^toSir C]xt\i\o fhp.v Wren Knight^the findifig a Streight 
line equal to thai of a Cycloid^ aptd to the parts thereof, two other 
Letters^ copfinant to the former ^ one of the Lord Vij-count 
ErouDckcr , the other ^ of the jaid Chv Wren* A^ Account of 
Monjieur Du Hamel's Boo\ De Corpore Animsto* 
AnAccount of theCurrent of theTydesabout tbeOrcadcs^gipen in by 
aGentleman of Scotlmd, who hadpafs'dhi^^felf that wa/^^^ from 
him commumcated to the Tuklifher by the truly Honour able Sir 
Robert Moray Knight^ deceafed. lately oneof theVice^TreJidents 
of the KSocitty .of which he had been Prefident formerly ^ xs>hofe 
Death is no left defervedly than exceedingly lamented bj ali that 
fyietP his Worth ^Knowledge ^ Integrity ^Prudeme^ and Courage^ 
N Fairay-Soumd (betwixt the Ifles of Fairay aod ^jha in Ork- 
ney) theSea runDethNprth'€ai1'5 for the fpace only of three 
hours in Flowing^ and nme boot^ South-weft in Ebbing. This is 
the courfe of the Tide only in the middle of the Sound, which is 
but one mile broad. 
Theoext lfle tof,2/r^;' , towards the Soutbweftj h Welira^ 
which is an lflaud about five miles in kcgtbs -and; three or four 
miles 10 breadth. Upon the South-eaft fide of this Iflaod^withip a 
mile to the ftiore.lyeih another little Ifle^which is not half a mile 
in Circumference. South aod South-weft from ihcfe two Iflarjds, 
gi 
dinarily pafs/in thdre^^^^ . 
Uuuuuu Whilft 
