ON THE SEASONAL VARIATIONS OF TEMPEKATURE. 



505 



CuEVK XXI.— Thurso at Thurso. 10 to 10.30 a.m. 



CUBVE XXII.— Thurso at Dale. 10 A.M. 



Almond. 



From January 1888 to July 1891, with a few unavoidable interrup- 

 tions, Mr. J. Paterson, Almondbank, Perthshire, observed the temperature 

 of the Almond at a point about one and a half mile above the junction 

 of that river with the Tay. The weekly means are given in Curve XXIII. 

 (see Plate), from which it appears that, except in some winter minima, 

 the temperature of the water is always lower than that of the air, 

 although the two come closer together when the seasonal temperature 13 

 falling than when it is rising. A noticeable feature in this carve is its 

 very irregular form, and the fact that the fall and rise of temperature 

 from one week to another is often greater for the water than for the air. 



