MADE AT MARIETTA, OHIO. 



17 



By means of these numbers the monthly means of the preceding table were all 

 referred to the mean resulting from hourly observations ; these corrected vakies are 

 contained in Table III. The manuscript table of monthly means (prepared at the 

 Smithsonian Institution) was used in preference to the printed means in Silliman's 

 Journal, for years for which the original record was lost ; these values were like- 

 wise corrected to refer to 24: observations a day. 



Table III. — Resultino Mean Monthly Temperatures observed at Marietta between 





1818 AND 1859 INCLtrSIVE. 











Tear. 



Jan. Feb. 



March. 



April. 



May. 



June. 



July. 



August. 



Sept. 



Oct. 



Nov. 



Dec. 



1818 



. . 1 . . 



. . 



. . 



. _ 



72°. 62 



77°.19 



74°.56 



64°.02 



51°.42 



46°.26 



32°. 54 



1819 



40°. 28 



38°.ll 



38°.58 



52°.82 



63M9 



72.53 



74.50 



75.95 



63.40 



49.98 



46.23 



33.28 



1820 



27.10 



42.14 



40.44 



57.96 



61.75 



72.18 



76.72 



72.86 



66.87 



48.21 



38.36 



32.29 



182] 



24.83 



37.00 



36.84 



48.84 



64.27 



74.05 



72.17 



74.50 



67.50 



52.46 



38.55 



28.31 



1822 



28.69 



32.02 



45.89 



53.70 



69.17 



74.22 



75.36 



74.12 



65.69 



51.96 



47.03 



31.22 



1823 



32.50 

 30.51 



25.38 

 36.93 



42.37 

 48.53 



51.00 



67.32 



72.85 



72.31 



71.21 



66.52 



55.88 



42.75 



33.06 



1826 



1827 



26.54 



41.68 



46.29 



56.09 



60.28 



65.23 



74.95 



74.49 



66.90 



54.38 



42.59 



41.58 



1828 



41.68 



43.88 



48.69 



50.43 



63.09 



73.69 



71.07 



73.22 



62.32 



52.17 



45.32 



39.03 



1829 



32.95 



26.09 



37.44 



50.64 



65.57 



71.25 



71.69 



71.68 



62.81 



54.88 



39.27 



43.72 



1830 



31.21 



34.37 



47.00 



58.58 



61.07 



68.35 



75.03 



73.73 



64.30 



57.37 



49.54 



35.45 



1831 



25.80 



29.14 



45.28 



54.68 



60.50 



70.47 



71.40 



69.81 



62.67 



53.99 



40.03 



20.49 



1832 



29.07 



37.77 



43.45 



54.78 



61.00 



68.63 



70.97 



69.64 



63.36 



54.07 



43.41 



35.72 



1833 



35.76 



35.10 



39.73 



56.58 



68.02 



66.33 



72.60 



69.80 



65.95 



49.54 



40.56 



36.51 



1834 



26.99 



43.03 



43.73 



55.97 



60.82 



69.57 



76.22 



72.49 



63.30 



49.97 



43.34 



35.32 



1835 



33.84 



24.37 



40.51 



49.94 



63.54 



68.64 



69.84 



68.35 



57.18 



54.93 



44.55 



30.81 



1836 



31.01 



26.87 



36.03 



55. .30 



65.69 



68.54 



71.89 



68.94 



68.29 



45.53 



36.73 



30.28 



1837 



27.79 



34.15 



41.46 



46.56 



60.64 



67.01 



71.56 



70.04 



62.80 



53.46 



45.29 



34.64 



1838 



34.65 



20.65 



45.41 



48.59 



55.43 



70.97 



77.10 



75.58 



64.11 



48.20 



38.23 



27.90 



1839 



35.10 



35.60 



42.37 



57.58 



64.53 



66.09 



72.25 



68.04 



59.93 



58.21 



37.50 



31.79 



1840 



24.32 



40.80 



46.48 



56.58 



62.34 



68.74 



71.41 



71.55 



59.82 



52.81 



40.22 



32.18 



1841 



32.04 



31.79 



42.16 



49.66 



60.05 



73.19 



71.90 



70.59 



66.50 



48.53 



42.47 



35.76 



1842 



36.15 



37.05 



51.87 



56.21 



59.10 



66.87 



70.40 



67.30 



64.16 



50.34 



36.11 



33.13 



1843 



36.53 



26.35 



28.15 



51.14 



60.47 



67.49 



72.83 



70.80 



68.77 



47.78 



39.62 



34.64 



1844 



29.79 



35.25 



42.79 



61.31 



64.00 



68.34 



74.12 



69.92 



63.27 



48.85 



42.20 



34.29 



1845 



36.41 



38.15 



43.15 



57.18 



58.83 



68.89 



71.68 



72.44 



63.88 



50.69 



39.86 



24.71 



1846 



33.05 



31.19 



43.40 



56.75 



64.85 



67.05 



72.12 



74.41 



70.01 



51.64 



46.22 



37.66 



1847 



31.29 



35.42 



39.57 



53.90 



61.70 



66.38 



70.92 



68.18 



62.34 



50.99 



44.12 



34.65 



1848 



35.77 



35.49 



39.46 



52.36 



63.76 



67.78 



70.51 



70.47 



59.68 



51.81 



37.67 



42.56 



1849 



30.33 



29.66 



44.65 



50.64 



61.56 



71.38 



71.31 



69.85 



62.59 



51.93 



47.08 



31.20 



1850 



35.37 



34.36 



39.15 



48.71 



55.92 



69.19 



76.32 



71.93 



63.56 



51.56 



44.41 



34.38 



1851 



34.14 



40.52 



45.06 



51.30 



61.67 



66.81 



72.66 



70.34 



66.47 



52.27 



39.03 



27.70 



1852 



24.84 



34.95 



44.31 



48.78 



62.76 



66.36 



73.24 



69.07 



64.36 



57.96 



41.65 



39.08 



1853 



32.55 



34.76 



40.69 



53.05 



61.53 



74.08 



72.39 



71.65 



64.48 



49.36 



45.89 



30.80 



1854 



30.72 



37.76 



45.36 



50.94 



62.77 



70.42 



76.39 



73.84 



70.19 



56.06 



41.17 



31.95 



1855 



34.96 



25.67 



88.42 



55.44 



62.81 



66.85 



75.35 



73.51 



70.28 



50.33 



47.25 



33.24 



1856 



18.61 



25.32 



32.28 



54.35 



61.31 



72.51 



76.67 



69.79 



63.95 



53.89 



40.92 



28.90 



1857 



18.75 



42.53 



37.86 



42.56 



57.63 



68.21 



72.70 



72.40 



66.75 



52.03 



40.05 



38.64 



1858 



40.11 



27.71 



39.77 



53.62 



60.64 



72.36 



75.09 



72.26 



64.53 



56.53 



38.44 



40.28 



1859 



32.86 



36.86 



48.63 



50.85 



66.14 



67.41 



74.01 



70.90 



64.15 



49.15 



44.20 



30.06 



Mean, 



31.41 



34.00 



42.14 



53.04 



62.25 



69.58 



73.25 



71.54 



64.56 



52.08 



42.16 



33.58 



Mean Annual Temi^erature. 



Taking the annual means of the monthly values given in Table III, after substi- 

 tuting the respective monthly means of the whole series for those months in 1818 

 and 1823 where our series is defective, we find the annual mean temperature for 

 40 years as follows ; — 



July, 1867. 



