XXIV ADVERTISEMENT. 



II. The fécond proof of the elongation of the 

 Earth at the Poles is atmofpheric. It is well 

 known that the height of the Atmofphere dimi- 

 niflies, in proportion as we afcend upon a moun- 

 tain. Now this height diminifhes likewife, in 

 proportion as we advance toward the Pole. I am 

 furnidied, on this fubjeâi, with two barometncal 

 experiments. The firft for the Northern Hemi- 

 fphere j and the fécond for the Southern Hemi- 

 fphere. The mercury in the Barometer, at Paris, 

 iinks one line, at the height of eleven fathom ; and 

 it finks likewife one line in Sweden, on an elevation 

 of only ten fathom, one foot, fix inches, and four 

 lines. The Atmofphere of Sweden, thciefore, is 

 lower, or, what amounts to the very fame thing. it*s 

 Continent is more elevated than the Land at Paris. 

 The Earth, therefore, lengthens out as you proceed 

 northward. This experiment, and it's coife- 

 quences, cannot be rejedled by the Academicians ; 

 for they are extraded from the Hiftory of the Aca- 

 demy of Sciences, year 1712, page 4. Con fuit 

 the Explanation of the plates, Atlantic Hemi- 

 fpherc, beginning of Vol. I, 



III. The fécond experiment, to prove the lower- 

 ing of the Atmofphere at the Poles, was made to- 

 ward the South Pole. It confifts of a feries of ba- 

 rometrical obfervations taken, from day to day, in 

 the Southern Hemifphere,, by Captain Cook, duiing 



the 



