128 APPLICATION OF PRINCIPLES. 



temperature is 50 - 62 : * in other parts of the world 

 it is very different ; and the amount of those differ ■ 

 ences, together with the means of imitating them arti- 

 ficially, constitutes one of the most delicate and diffi- 

 cult parts of the gardener's art. All that relates 

 to this subject, however, to be treated usefully, must 

 be considered in a very special way, and in such 

 detail as can only be expected in a separate work 

 upon the subject. An idea of the difference between 

 the atmospherical moisture of London and that of 

 other parts of the world may, however, be collected 

 from the following table showing the amount of rain 

 that falls in. a few different countries: 



Inches per Annum. 



London 24-01 Average of 10 years. 



St. Petersburgh .... 16- 



Algiers 27* 



Fattehpur (East Indies) . 35-94 Average of 4 years. 



Madeira 31- 



Sagar (East Indies) . . . from 31-15 to 64-76 



Bahamas 54-99- 



Calcutta from 59-83 to 81* 



Ceylon 84-3 



Macao from 48'8 to 107*8 



Equator 96- 



CoaBt of Malabar .... 123-50 Average of 14 years. 



Grenada 126* 



Leogane, St Domingo . . 150' 



Bengal, 20 to 22 inches in a single month. 



Bombay, 32 inches in 12 days. 



Tavoy, 203'5 inches in six months; as much as 

 8-5 in a day (July 31, 1831). f 



* See the various meteorological journals published by the Horti 



cultural Society, in their Transactions, from the year 1826 inclusive, 



f [The average fall of rain (and snow) in the State of New York; 



