OF THE ATMOSPHERIC TEMPERATURE. 



319 



Secular variation in the annual maxima and minima, compared tvith the varia- 

 tion in the a^mual means. — In conclusion of this section of the paper, it is still 

 desirable to inquire into the changes of the maxima and minima, and to ascertain 

 how far these partake of the character of the secular change of the mean annual 

 temperature. For this purpose it will suffice to examine the two typical series at 

 New Haven and Marietta. Since the minima fall generally in January and Feb- 

 ruary, and the maxima in July and August, the respective mean temperatures of 

 these' months were formed and compared Avith the corresponding annual means. 

 To eliminate irregularities, the fourth order means Avere employed and tabulated; 

 comparing each value with the mean from the whole series, the differences 

 were formed, a -J- sign indicating higher temperature, a — sign lower temperature 

 than the mean — they are as follows : — 



New Haven series. 











Differences from 











Differences from 





HJ.&F.) 



JQ.&A.) 



A(J-toD.) 



Mean. 





HJ-&F.) 



HJ.&A.) 



j\{].toT>.) 



Mean. 



Jan. 

 and 



July 

 and 





Jan. 

 and 



July 

 and 







4th order. 



4tli order. 



4tli order. 



Year. 





4th order. 



4th order. 



4th order. 



Year. 











Feb. 



Aug. 













Feb. 



Aug. 

























^ 



^ 





^ 



^ 



^ 



^ 



I7S0 



(29.6) 



74-3 



(49-9) 



+2.4 



+3-6 



+ 1.0 



1825 



29.5 



71.2 



49.9 



+ 2.3 



+o°5 



+0.9 



I7SI 



29.5 



73 



3 



49 



7 



+2.3 



4-2.6 



+0.7 



1S26 



29.0 



71.0 



49 



9 



+ 1.8 



+0-3 



+ 1.0 



1782 



28.1 



72 







49 



2 



+0.9 



+ 1-3 



+0.3 



1827 



29.1 



70.7 



49 



9 



+ 1-9 



0.0 



+ 0.9 



1783 



26.0 



71 



3 



48 



s 



— 1.2 



4-0.6 



—0-5 



1828 



29.1 



71.0 



50 







+ 1-9 



+0.3 



+ 1.I 



I7S4 



24.5 



71 



I 



48 







—2.7 



4-0.4 



—0.9 



1829 



27-5 



71.4 



49 



9 



+0.3 



+0.7 



+0.9 



I7S5 



24.7 



70 



7 



47 



9 



—2.5 



0.0 



— 1.0 



1830 



25-5 



71.7 



49 



6 



-1-7 



+ 1.0 



+0.7 



I7S6 



26.0 



70 



3 



48 



2 



^1.2 



—0.4 



—0.7 



1831 



25-3 



71.6 



49 







—1-9 



+0.9 



0.0 



1787 



26.5 



70 



6 



48 



8 



— 0.7 



— 0.1 





1832 



26.5 



70.6 



48 



5 



—0.7 



— 0.1 



-0.4 



1788 



26.5 



71 



7 



49 



2 



— 0.7 



-hi.o 



+o'3 



1833 



27.7 



69.9 



48 



2 



+0.5 



—o.S 



—o.S 



1789 



27.1 



72 



2 



49 



4 



— 0.1 



+ 1.5 



+0.4 



1834 



27-3 



69.8 



47 



8 



+0.1 



—0.9 



— I.I 



1790 



27.8 



71 



7 



49 



4 



+0.6 



4-1.0 



+0-5 



1S35 



25.0 



69.8 



46 



8 



— 2.2 



—0.9 



— 2.2 



1791 



27.1 



70 



9 



49 



2 



— 0.1 



4-0.2 



+0.2 



1S36 



23-5 



68.8 



46 



3 



-3-7 



— 1-9 



—2.6 



1792 



26.5 



70 



7 



49 



2 



—0.7 



0.0 



+0.3 



1837 



24.5 



68.8 



46 



7 



—2.7 



—1.9 



—2-3 



1793 



27-3 



70 



9 



49 



5 



+0.1 



4-0.2 



+0.5 



1838 



26.5 



69-3 



47 



8 





—1.4 



— I.I 



1794 



27.8 



71 







49 



6 



+0.6 



4-0.3 



+0.7 



"839 



27-3 



69.6 



48 



7 



+0^1 



— I.I 



—0-3 



'795 



27-5 



71 



I 



49 



I 



+0.3 



4-0.4 



+0.1 



1S40 



27.S 



69.8 



49 



I 



+0.6 



— 0.9 



+0.2 



1796 



27-3 



71 



6 



48 



6 



+0.1 



4-0.9 



-0.3 



1841 



29.1 



6g.8 



49 



3 



+1-9 



—0.9 



+0.3 



1797 



27.0 



72 



5 



4S 



5 



— 0.2 



+ 1.8 





1842 



29.5 



69-3 



49 



I 



+2.4 



—1.4 



+0.2 



1798 



26.5 



73 







48 



7 



— 0.7 



+2.3 



— 0.2 



1843 



28.1 



68.8 



49 







+0.9 



—1.9 



0.0 



1799 



26.4 



72 



9 



49 



2 



— o.S 



+2.2 



+0.2 



1844 



27.1 



69-3 



49 



4 





—1.4 



+0,5 



iSoo 



27-3 



72 



5 



49 



9 



+0.1 



+ 1.8 +1.0 



1845 



27.4 



70-3 



49 



9 



+a2 



— 0.4 



+0.9 



1801 



2S.9 



72 



5 



50 



6 



+ 1-7 



+i.8;+i.6 



1846 



27.7 



71.2 



49 



9 



+0.5 



+O.S 



+ 1.0 



1802 



29.8 



72 



7 



50 



8 



+2.6 



+2.0+1.9 



1S47 



27.7 



71.4 



49 



4 



+0.5 



+0.7 



+0.4 



1803 



29-3 



72 



7 



50 



7 



+ 2.1 



+2.o!+i.7 



1848 



27.1 



71.0 



49 









+0.3 



+0.1 



1804 



28.3 



72 



6 



5° 



6 



+I.I 



+1.9 



+ 1-7 



1S49 



27.1 



70.6 



48 



7 



— I 







1805 



28.2 



72 



3 



50 



5 



4-1.0 



+ 1.6 



+ 1-5 



1850 



28.4 



70.3 



48 



7 



+ 1.2 



—0.4 



— 0.2 



1806 



28.6 



71 



8 



5° 



I 



+1.4 



+ I-I 



+ 1.2 



1851 



29.1 



70.0 



48 



9 



+ 1-9 



—0.7 



— 0.1 



1807 



28.4 



71 



2 



49 



8 



+ 1.2 



+0.5 



+0.8 



1852 



28.7 



69.8 



49 



I 



fi-5 





+0.2 



1S08 



27.9 



70 



3 



49 



7 



+0.7 



—0-4 



+o;8 



1853 



28.6 



70.0 



49 



2 



+ 1.4 



— 0.7 



+0.2 



1809 



27.7 



69 



6 



49 



7 



4-0.5 



— I.I 



+0.7 



1854 



27.9 



70.4 



49 



I 



+0.7 



—0.3 



+0.2 



iSio 



27.8 



69 



4 



49 



5 



4-0.6 



— 1-3 



+0.6 



1855 



26.1 



70.4 



48 



5 



— I.I 



-0.3 



—0-5 



1811 



27.2 



69 



5 



49 



I 



CO 



— 1.2 



+0.1 



1856 



24.6 



69.8 



47 



9 



—2.6 



—0.9 



— 1.0 



I8l2 



26.2 



69 



8 



48 



S 



I.O 



— 0.9 



—0.4 



1857 



25-5 



69.1 



47 



7 



—1-7 



—1.6 



—1-3 



1813 



25-9 



70 



2 



48 



3 



—1-3 



— 0-5 



—0.7 



1858 



27.4 



68.7 



47 



9 



+0.2 



— 2.0 



— 1.0 



1814 



25.8 



70 







48 



2 



—1.4 



—0.7 



—0.7 



1859 



28.1 



68. 7 



48 



3 



+0.9 



— 2.0 



—0.7 



1S15 



25.4 



69 







47 



6 



—1.8 



—1-7 



—1-4 



i860 



28.1 



69.4 



48 



8 



+ 0.9 



— 1.3 



— 0.1 



1816 



24.5 



68 



3 



47 







—2.7 



—2.4 



-1-9 



1861 



28.1 



70.4 



49 



3 



+0.9 



—0-3 



+0.3 



1S17 



24.0 



68 



S 



46 



8 



—3-2 



— 2.2 



— 2.2 



1862 



28.5 



71.6 



49 



6 



+ 1-3 



+o.9i+o.7 



1818 



25.1 



69 



4 



47 



3 



^2.1 



—1-3 



—1.6 



1863 



28.9 



72.5 



49 



7 



+ 1-7 



+ 1.8+0.7 



1819 



26.8 



70 



2 



47 



9 



—0.4 



—0.5 



— I.I 



1864 



(28.5) 



(72.7) 



(49 



7) 



+ 1-3 



-f 2.0 4-0.8 



1820 

 1821 



27.0 

 25.9 



70 

 70 



3 

 2 



48 

 48 



I 



2 



— 0.2 

 —1-3 



—0.4 

 —0.5 



—0.8 

 —0.8 





























1822 



25.7 



7c 



2 



48 



6 



— i-S 



—0.5 



— 0-3 



Mean 















1823 



27.0 



70 



5 



49 



I 



— 0.2 



— 0.2 +0.1 



of 85 



27.24 



70.69 



48.93 









1824 



28.7 



71.0 



49.6 



4-1-5 



+0-3+0.7 



years. 















