UPPEE INDIA. 



57 



amount of heat used up in the evaporation of moisture from 

 the leaves of the trees ; and the amount of vapour in the air 

 from the evaporation would lessen the amount of solar heat 

 falling on the surface of the earth. The extent of the surface 

 of the earth exposed to the direct action of solar heat would 

 be lessened, and the exposed surface would be less heated. 

 If it is admitted that the hot west Winds are the results of the 

 heating of the surface of the earth by the direct incidence of the 

 rays of the sun, it must follow that they would be moderated 

 in proportion to the reduced surface area exposed to the action 

 of the sun, and to the lessened heating of that surface. 

 Should there still be west winds, the trees would mechanically 

 break their force and deflect them upwards ; their sweeping, 

 drying effects on the surface would be less j the ground 

 would not be so hardened in the hot weather as it now is, 

 and the vapour in the air, now carried away to the east by 

 the strong west winds, would, as the winds became more 

 moderated or subdued, remain suspended over the country, 

 and be present in the superincumbent air to be deposited as 

 dew or rain. 



The statement is frequently made that the hot west winds 

 are useful in keeping houses and buildings cool by promoting 

 evaporation from tatties, &c. What is this but an admission 

 that the hot winds are useful to this extent that we can in 

 houses, by their means, moderate the heat that has created 

 them, and which they themselves intensify. Also that some 

 method of cooling houses is, under existing circumstances, 

 necessary, and in the case of tatties this is done by evapora- 

 tion, which moistens the air in the houses. 



In the case of a well- wooded country the result is the same 

 the evaporation cools the air. It is common in describing 

 a place to say it is green and cool-looking. This combination 

 of greenness and coolness is not altogether imaginary, as 



