15 
liAd the mean of all these is 49°'9, as the mean temperature of the 
ipjpr.—being of the same value as found from the monthly results. 
tm,|The mean temperatures of the years 1828, 1831, 1834, and 1868, 
^Ire all above 52°. The year of highest temperature was 1868, and 
v | value was 52°*3. 
jjThe mean temperatures of the years 1829, 1838, 1855, and 1860, 
e s t|re all below 48°. The year of lowest temperature was 1860, and its 
line was 47°'l. 
Thus 44 years, from 1826 to 1869 inclusive, give a mean tempera- 
ire of 49°‘9, with a variation, between one year and another, from 
|°*1 in 1860 to 52°-3 in 1868. The difference is 5 0, 2. 
