496 



REPORT — 1891. 



means of both, although occasionally they approach very closely. This 

 greater cold of the water was observable in nearly all the rivers on which 

 observations were taken, and on some was more marked than in the case 

 of the Severn. The river-temperature followed the air-temperature closely 

 at all seasons. 



Curve XIII.— Severn, Stourport. 9 A.M. 

 Air Wa£er 



Cl'Rve XIV. — Lugg, Aymestr 

 9 or 10 A.M. 



Air fl'-'oUe/- 



m 



mm 



Lugg. 



Observations on the Lugg were made by Mr. A. Ward from April to 

 September 1889, at Aymestry, in the north of Herefordshire. The 

 temperature of the water was always considerably below that of the air, 

 but the period of observation was too short to bring out any important 

 relations (see Curve XIV.). 



