Pres. Caldwell on the Mean Temperature of Chapel Hill. 249 



Abstract of Calculations of thejirst 20 * days of a Meteorologi- 

 cal Diary kept at Port Macquarie,for June 1824. 



Art. XIV. — On th& Mean Temperature of Chapel Hill, 

 North Carolina, as determined by President Caldwell. 



In determining the laws of the distribution of heat on the 

 earth's surface, there is a particular interest attached to obser- 

 vations made on the American continent, and that interest in- 

 creases, if the observations are made either near the arctic cir- 

 cle, or towards the tropics. 



We were therefore, much gratified with the following ob- 

 servations, made at Chapel Hill, North Carolina, in lat. 35° 

 54', which are published in the American Journal qfScience 9 

 vol. x. part ii. 



Mean, 59°.89 59°.19 61°.53 



* As the original tables contain nearly 22 days' observations, we have 

 retained them in our averages. — Ed. 



f This thermometer was kept on the Barrack Hill, at an elevation of 65 

 feet above the level of the sea, and 52 feet above the other thermometer. 



