214 
The mean temperature of Bath, deduced from nine years’ obser- 
vations 1866-1874, as seen in the above table, is 50°.5. The 
result is exactly the same, if deduced from ten years’ observations, 
commencing with March Ist, 1865, and ending with February 
28th, 1875. 
The highest yearly mean during the above nine years was 52°.0, 
in 1868. The lowest yearly mean was 49°.4,in 1870. The 
range of the mean, therefore, may be set at 2°.6, 
Five of the nine years were above the mean, viz. :—1866, 1868, 
1869, 1872 and 1874, Four were below the mean, viz. :—1867, 
1870, 1871 and 1873. The year making the nearest approach to 
the exact mean was 1869. 
In 1868, the hottest year in the series, seven months were above 
the mean monthly temperature, viz.:—March, May, June, July, 
August, September and December. _ In 1870, the coldest year in 
the series, six months were below the mean monthly temperature, 
viz. :—January, February, March, September, November and 
December. And it is noticeable that in the former instance, the 
months in excess occur chiefly in the spring and summer, while 
in the latter instance, the months in deficiency occur chiefly in the 
autumn and winter. Hence, in a general way, not only does the 
excess of mean temperature in one of these years balance the 
deficiency in the other, but the balance would seem to be kept up 
as regards the particular months in which the excess and deficiency 
respectively occur. 
If now we confine our attention to the monthly means in the 
bottom line of the above Table it will be seen that the mean 
temperature rises very slowly from January to March, but makes 
a sudden and considerable advance in the months of April and 
May. It then makes another and almost as great an advance in 
June, and the same again in July, in which month it attains its 
maximum. The mean temperature of August is but little below 
that of July. There is a decided fall in September and October, 
and a still more marked fall in November, the mean temperature 
of this last month being scarcely 3° above that of December when 
