RESULTS OF OBSERVATIONS 



TEMPERATURE OF THE ATMOSPHERE. 



The observations for temperature made by Mr. Wood commence in June, 1818, 

 and extend without interruption to March, 1823. The reading of the thermometer 

 was recorded daily at sunrise, 2 P. M., and at sunset, excepting the last five months 

 when the evening observations were omitted. 



Dr. Hildreth's series commenced in 1824, but the record of the first two years is 

 lost; it extended without interruption to December, 1859; of the years 1851, 

 1855, 1856, and 1857 only the monthly means are preserved. His thermometer 

 has a tube 10| inches in length, and bears the mark "Carpenter, London." It was 

 suspended in the shade, had a northern exposure, and was read three times a day, 

 generally at 6, 2, 9 in summer, and at 7, 2, 9 in the winter months (November, 

 December, January, and February), with such exceptions respecting the time of the 

 morning observations as are noted at the head of columns in Table II. In a few 

 instances only was the 2 P. M. observations shifted to 3 P. M., as stated in the 

 table. 



Tables I and II contain the (uncorrected) daily means,^ from 3 observations 

 (excepting the 5 months mentioned above), also the monthly (uncorrected) means, 

 expressed in degrees and decimals of Fahrenheit's scale. 



^ These means, together with the monthly means, were inserted in the manuscript record by Prof. 

 W. Rogers Hopkins. 



June, 1867. 



(1) 



