STUDY IV. 193 



quarters of an hour from one day to another, and 

 which feems to be regulated by the different dia- 

 meters of the polar cupola of ice, the extremities 

 of which, melted by the Sun, diminifh and retire 

 from us every day, and whofe effufions muft, con- 

 fequently, require more time to reach ihe Line, 

 and to return from the Line to us. Neither (liall 

 I dwell on the other relations which thefe polar 

 periods have to the phales of the Moon, efpeciuUy 

 when fhe is at the full; for her , rays poiTefs an 

 evaporating heat, as the late experiments, made at 

 Rome and at Paris, have demc^nftrated : for this 

 would lay me under the neceffity of detailing a 

 feries of obfervations and fads, which might carry 

 me too far. 



Much lefs Qiall I involve myfelf i n a difcuffion 

 of the Tides of the South Pole, which, in the 

 Summer of that Pole, in the open Sea, come im- 

 mediately from the South and South-weft, in vaft 

 furges, conformably to the experience of the Dutch 

 Navigator, Abel Ta/tnan, in the months of January 

 and February 1692; and of their irregularity on 

 the coalts of that Hemifphere, fuch as thofe on 

 the coafts of New Holland, where Dampier, in 

 the month of January 1688, found, to his great 

 aftonifhmentj that the higheft Tide, which fet in 

 from eaft- quarter-north, did not com.e till three 

 days after full moon, and where his fhip's com- 

 voL. I. o pany, 



