ARTICLE XYI, 



xRbstract of Meteorological Tables in the possession of the American Philo- 

 sophical Society. 



TABLE I. 



Jlbslracl of a Journal of the State of the Thermometer at Philadelphia, during the years 1758, 

 1759, 1767, 1768, 1769, 1770, 1771, 1772, 1773, 1774, 1775, 1776, 1777. 





Jan. 



Feb. 



March. 



April. 



i May. 



June. 



July. 



Aug. 



Sept. 



Oct. 



Nov. 



Dec. 



Mean 

 Annual 

 Temp. 



1758— Greatest Heat. 



64° 



470 



57° 



740 



740 



850 





87=> 



85° 



80° 



73° 



62° 



47° 





Least Heat. 



19 



23 



25 



35 



47 



63 





64 



60 



51 



40 



30 



18 





Mean Heat. 



37 -2 



32-2 



38 -6 



53 -3 



63 -5 



72 



•1 



75 -7 



71 -3 



64 



56 -7 



44 



34 -5 



53°-6 



1759— Greatest Heat. 



43 



53 



61 



70 



77 



85 





86 



88 



79 



71 



62 



51 





Least Heat. 



18 



26 



19 



44 



51 



54 





63 



58 



58 



43 



30 



16 





Mean Heat. 



30 



38 



41 -4 



49 -4 



52 -4 



71 



•6 



73 



69 -7 



65 -2 



55 -3 



46 -4 



30 -4 



52 -7 



1767— Greatest Heat. 



51 



53 



63 



69 



78 



86 



•5 



84 



86 



76 -5 



74 



68 



52 





Least Heat. 



12 



15 



13 



42 



45 



63 





63 



63 



50 



38 -5 



32 



18 





Mean Heat. 



31 -7 



32 -5 



41 



51 



61 -6 



71 



•2 



74 



75 -5 



64 -5 



54 



46 -7 



35 -3 



53 -2 



1768— Greatest Heat. 



45 



61 



59 



69 



77 



78 





83 



82 



77 



65 -5 



55 



54 





Least Heat. 



8 



28 



22 



23 



41 -5 



57 





62 



59 



52 



34 



26 



13 





Mean Heat. 



28 



46 



39 -5 



46 



59 



68 



•6 



71 -5 



65 -7 



64 



50 



42 



37 -7 



51 -5 



VI 4 Y 



