ipO STUDIES OF NATURE. 



Southern Hemifphere, the Tides fet in northward, 

 as was obferved by William Schotiten, who, in Ja- 

 nuary 1 66 1, difcovered Maires Strait. But fuch, 

 on the contrary, as have gone thither in the 

 Winter of thofe regions, have found that the Tides 

 run fouthward, and came from the North, as was 

 obferved by Frajer in the month of May of the 

 year 1712. 



It now feems, to me, poflible to explain the 

 principal phenomena of our Tides, from thefe po- 

 lar efFufions. It will be evident, for example, 

 why thofe of the evening (hould be ftronger, in 

 Summer, than thofe of the morning ; becaufe the 

 Sun aâ:s more powerfully by day than by night, 

 on the ices of the Pole, which are on the fame 

 Meridian with ourfelves. This efFed refembles 

 the intermittance of certain fountains which are 

 fupplied from mountains of ice, and flow more 

 abundantly in the evening than in the morning. 

 It will, farther be evident, how it happens that our 

 morning Tides, in Winter, rife higher than thofe 

 of the evening ; and why the order of our Tides 

 changes, at the end of every fix months, as Bou- 

 guer * has well remarked, who thought the fadl 

 afloniQiing, but without affigning any reafon for 

 it ; becaufe the Sun being alternately toward both 



* Bouguer, Treatife of Navigation, page 153. 



Poles, 



