METEOROLOGY AND CLIMATE. 195 



The curious lifting of the cloud at the rate of 

 about 1,000 feet an hour is, as I have mentioned 

 before, the leading clue to the arrangement of the 

 Floral Zones. The cloud in the morning covers 

 pretty nearly that portion of the mountain which 

 is occupied by the forest and bamboos. Its lower 

 and upper boundary corresponding to the beginning 

 of the forest and the upper limit of the bamboo 

 region. From this it follows at once that the 

 heather region receives the sunlight in the 

 morning, and only at that time, and hence 

 the flora is of a comparatively temperate type. 

 The true forest receives the full heat of the 

 afternoon sun, and this, together with abundant 

 moisture, explains the main features of its plants. 

 The bamboos, on the other hand, receive scarcely 

 any sunlight worth mentioning. 



A very curious phenomenon is a violent wind, 

 sometimes almost of hurricane force, which sweeps 

 down the valleys, particularly those leading 

 directly to the snow peaks, at about 6 to 7 p.m. 

 It is a phenomenon very closely related to the land 

 breeze, and the figure copied from Dr. Mill's 

 excellent work, " Realm of Nature " (Fig. 31), very 

 exactly represents it. Dr. Mill says: " When 

 a range of mountains rises near the sea, very 

 strong winds are produced, the mountain slope 

 acting like a flue, aiding the ascent of hot air by 

 day and the descent of cold air by night." 



I believe the data on which these figures depend 



