xlvi Contents 



PAGE 



Table X gives a heat-account of the water at the 

 Inversnaid station at different dates .... 333 



This is further developed in Table XI . . 334 



Here also the water holds the maximum amount <>t 

 heat in the third week of September .... 335 



Hence the law: Heat accumulates in the deep 'lakes 

 so long as the day is longer than the night and it 

 diminishes when the night is longer than the day . 336 



At a depth of 100 fathoms the range of tempera- 

 ture of the water in a single season does not exceed 

 o-3Fahr 337 



Observations of the temperature of the bottom 

 waters of the lakes of the Caledonian Canal in five 

 consecutive autumns ....... ^38 



Chart of Loch Lomond ...... 339 



It is probable that the most powerful means of 

 supply and removal of heat is direct radiation, and the 

 most powerful mixing agent is the wind . . . 340 



No. 22 THE WINDINGS OF RIVERS. [From Nature, December 



5. 10.07, Vol. LXXVII. pp. 100-102] .... 34 r 



Introduction. The regularity of the form assumed 

 by the beds of all streams, and especially by those of 

 large rivers flowing through plains consisting of alluvial 

 or other matter easily displaced by any current of water, 

 even the most insignificant, had always appeared to me 

 to be a fact in nature which expressed a law which had 

 not been stated. 



It was not until the meeting-place of the British 

 Association in 1892 was fixed in Edinburgh that I 

 began to put together my observations and reflections 

 on this subject, with a view to laying them before my 

 scientific brethren who would be there assembled. 



But on such an occasion there is rarely time for 

 the reading of extended papers; therefore I devoted 

 myself principally to preparing maps and diagrams to 

 fully illustrate the facts observed and the conclusions 

 arrived at. By doing so I hoped to be able at the meet- 

 ing to use to the best advantage whatever time might 

 be available for the exposition of their meaning. 



By taking this precaution I was able to make clear 

 to the very representative audience there assembled 

 the interpretation of the writing on the soil of the earth 



