240 
place as the case may be. Bath is an instance in which the 
climate is undeniably affected by the last of the above-mentioned 
causes, the hills that surround it on nearly every side giving it a 
more moderate temperature both in summer and winter. Yet it 
is under a disadvantage, so far as these same hills materially 
interrupt a free circulation of the air in hot weather, while the 
river along the valley is constantly exhaling vapour to increase its 
humidity. 
From this circumstance, the combined influence of temperature 
and humidity, in the case of the Bath climate, calls for especial 
consideration. And I have been led to say the more on this sub-. 
ject, because, by those who have treated of the Bath climate | 
hitherto, it has been very little attended to, if not entirely passed 
over. No meteorological Journal ever kept in Bath or its neigh- 
bourhood, which has come under my notice, with the exception of 
the register formerly kept at Ensleigh by the late Mr. Weston, 
and of which I shall have to speak further on, contains any 
observations on this head. The barometer and ordinary thermom- 
eter, with the additions in some cases of the wind-vane and rain- 
gauge, have been carefully registered, but no column has been 
allotted to the dry-and wet-bulb, or to any other form of 
hygrometer, from which we might ascertain the variations from 
month to month and from season to season in the humidity of the 
Bath atmosphere. It is of interest also to ascertain the relation 
of this humidity to the rain-fall, the more so from their respective 
variations being very different. Dr. Tunstall, in his “Climate of 
Bath,”* seems to confound these two things. Under the head of 
«“ Humidity” he treats of the rain-fall alone, giving Tables of the 
latter, from which he arrives at the conclusion “that Bath does 
not deserve the character for humidity which has been generally 
imputed to it.” 
What the rain-fall of Bath is will be considered further on. 
nn ee E EIIT IE SnIn ERR Nnm nen nERERNIEEE EEE EEE RSE ERE EERE 
* p. 39. 
