* 



lOO 



ICE. 



\ 



REMARKS 



G N 



T H S 



meter, during a whole year, did not vary, at a medium, above 20°*.. 

 It is therefore evident and beyond all doubt, that there is no large 



r 



i 



continent from 60° to 71" and upwards ; and that the inconfiderable 



\ 



fragments exiting there, are much colder than the lands in any cor- 



F 

 L 



' refponding Northern degree. 



L 



The fea bein*g a tranfparent body, the beams of the fun penetrate, 

 a great way into it, but at laft at the depth of about 271 feet Eng- 

 glifh meafure the rays of light do not pafs any farther, and a body 

 of the above-mentioned height * of fea-water, becomes perfedly 



opaqu 



f 



Wherever therefore 



bottom 



to be met with 



the depth of 45 fathoms, the fea cannot refledt any beams of the 



r 



r 



fun, Avhich are abforbed, and as it were fwallowed up m the deptb 



+ 



of the ocean : and as the refleilion of the beams of the {^an chiefly 



I 



contributes to the warm temperature of the air, it hence becomes 



- 



evident, that feas of great extent, which commonly exceed 45 fathoms 



depth, have never fo warm a temperature of the 



the 



lying under the fame parallel; and for the very fame reafon, iilands 

 of a moderate fize, furrounded by a great ocean, are not fo hot, as 

 large continents fituated under the fame parallel. To thefe particu- 

 lars may be added, the famous experiment of the burning mirror, 

 ■whofe focus,, when directed on a quantity of water, produces no heat. 



whereas 



* Dalryraple's Colkaion, and Philof. Tranf. vol. 66.. 



r 



4: Bouguer Efsai cFOptique fur la Gradation de la lumierc 



/ 



