ON THE SEASONAL VABIATIONS OP TEMPERATURE. 



495 



fathoms at higt water. Observations were taken by Mr. J. Pain and 

 Mr. J. Bartlett. They show (see Carve XI.) the same general features 

 as those at Breaksea, but the seasonal interchange of position in the air 

 and water curves is not quite so clearly marked. The tidal effects must 

 be important, judging from the result of calculations on observations 

 made at the Scottish lightships ; but it was impossible to carry out the 

 laborious reductions in time for this report. These three sets of obser- 

 vations were taken with great care and regularity. 



Monthly Means of Temperature Observations. 



Severn. 



Observations were made on the Severn at Stourport by Mr. Edward 

 Collens from March 1889 to May 1890. The observations were made 

 daily at 10 A.M. at a point on the east bank of the Severn, about 100 

 yards above the entrance of the Stour. A minimum depth of water is 

 retained in the river by a weir about a mile below the point of observa- 

 tion. At Stourport the Severn is rather less than 50 feet above sea level, 

 and it is 75 miles from Chepstow, where the river may be supposed to 

 meet the sea. The observations (Curve XIII.) show that the tempera- 

 ture of the water was almost always below that of the air, taking weekly 



