OF WIND 177 



a particular time or spot, as of the quality 

 of the wind affecting the temperature of 

 the water. Now, in the first place, the 

 effect will not be immediate. A change 

 from a warm to a cold quarter must take 

 some time to produce a change in the 

 fly-hatching condition of the water ; also 

 a wind actually coming from the east in 

 some particular locality may be but a 

 partial or subsidiary current and may 

 possess the quality of that from another 

 quarter, say the south. These considera- 

 tions may account for the frequency of 

 the exceptions, which are more than 

 sufficient to 'prove the rule.' In fact, 

 in order fully to analyse the applicability 

 of the general law, it would be necessary 

 to ascertain in each instance what wind 

 had previously prevailed when the 

 change took place, and whether the 

 present breeze was a true wind of a 

 quality determined by passage over 

 remote regions, or a mere back eddy." 

 Mr. Champneys' lucid and suggestive 



statement of the case might well serve as 



12 



