272 
observations relate to temperature, the dew-point and humidity of 
the atmosphere, the rain-fall, and the number of days on which 
rain fell more or less. 
The results are not without interest. With regard to the 
temperature of the air, the mean temperature of every one of the 
33 months, with the single exception of January, 1868, is lower 
at Ensleigh than at the Institution, the mean difference for the 
whole period being 2°.9, making Ensleigh to be nearly three 
degrees colder than the Institution Gardens. This difference pre- 
vails equally in the summer and in the winter months. And not 
only is the mean temperature for the period in question lower at 
Ensleigh, but the mazimum and minimum temperatures are 
likewise lower. 
The mean of all the maxima at Ensleigh is lower in each of 
the several months except four. In three of the excepted months 
it is the same at both places. In one instance alone it is higher 
at Ensleigh than at the Institution. There is, however, a greater 
difference in this respect in the winter months than in the summer. 
In summer the difference is very small, the mean of all the 
maxima at Ensleigh being at this season only three-tenths of a 
degree lower than at the Institution. In winter this difference 
amounts to 19.3. 
The mean of all the minima is lower at Ensleigh than at the 
Institution in every month except two; in one of the excepted 
months it is equal at the two places; in the other (this being 
also the only instance) it is higher at Ensleigh. And it is 
observable with regard to this mean, that there is no material 
difference between summer and winter, the difference for summer 
being 2°.4, for winter, 29.7; 2.¢., the night temperature at Ens- 
leigh falls as much below the night temperature at the Institu- 
tion at one season as the other, the difference in both cases being 
nearly as much again as the difference between the means of the 
highest day temperatures at the two places even in winter. 
Taking all the seasons together, the mean daily range of the 
