18 BULLETIN OP THE 



18Y0, 61° 



1871, 63° 



1872, 61° 



1873, 64° 



1874, 57° + 

 1870-1874, 60^ + 



Many changes were noted^ of which the following is a speci- 

 men : — 



July 24th, E. wind, 72° 



" 26th, S. W. " 56° 

 " 26th, E. " 65° 



One very rapid change occurred : — 



July 22d, 6 A. M. N.W. wind, 54° 

 " " 12 M S. E. " 65° 

 As a general result, these changes in temperature followed 

 changes in wind within three or four hours. 



A few exceptions were noted, where the rise in temperature 

 preceded the coming of the easterly wind by two or three hours. 

 The most satisfactory theory of this correlation is — that with 

 a strong wind off shore, the warmer surface waters are driven 

 off and replaced by the colder waters from beneath ; and, witii a 

 sea-breeze, the process is reversed. 



Some of these exceptions remain to be harmonized. 

 Several series of observations of temperatures at different 

 depths were taken, of which one will serve as a sample : — 

 July 31. Four miles E. from Boar's Head — 

 17 fathoms, 42^° 



15 " 43^ 



10 " 44^° 



5 " 47° 



4 " . . 49° 



Surface, 53° 



Mr. Button, among other remarks, suggested that hygrome- 

 trical observations were desirable, and might aid in the solution 

 of cooler winds coincident with warmer water. 



Mr. Abbe remarked that he found the anomalous cases quite 

 interesting, those, namely, concerning which Professor Chicker- 

 ing had stated that the change in the temperature of the water 

 was observed a few hours before the change in the wind occurred. 

 He did not think that we needed to have recourse to any occult 

 influence of the barometer, moisture, etc., but that probably the 

 simpler explanation would be found in the fact that over the sea 

 the wind had actually changed, but that its influence had not yet 



