THE 



PHILOSOPHICAL MAGAZINE. 



SEPTEMBER 1799- 



I. On the gradjial Changes in Temperature and Soil which 

 take place in different Climates, with an Enqtiiry into the 

 CaUfe ofthofe Changes. By the Abbe Manx *, 



Various authors, both ancient and modern, have 

 written on the fubjea of this Differtation, but merely in a 

 curfory manner ; one only. Dr. Hugh Williamfon, an Ame> 

 rican phyfician, has made it an objeft of particular atten- 

 tion; but what he has faid relates only to North America, 

 and is comprehended in a very ftort paper publifhed in the 

 Philofophical Tranfadions of Philadelphia for 1777. It has 

 ■ long appeared to me ihterefting enough to require farther 

 and more accurate examination ; but bf fore I enter into any 

 fcfearch rcfpeaing the caufes of thofe changes of tempera- 

 ture and foil, obfcrvcd in different countries during a long 

 feries of ages, it fecms to be neceflary firft to prove, by au- 

 thentic tellimony, that thefe changes have aftually taken 

 place. This Diflertatioii divides itfelf naturally into two 

 parts. In the firft I fliall collet all the inforryation of an- 



• From the Tranfaftions of the Eleiloral Academy of Sciences at Man- 

 hc:-m. Vol. VI. 



\'oL. IV. Z t-i<-'nt 



