FRUITS 



179 



imported into Manila. A very fine and large lime 

 grows in the Philippine forests. 



Climate. The different varieties of citrus fruits make 

 different demands on the climate. Some endure heavy 

 frost, while others will not thrive where the temperature 

 ever approaches the freez- 

 ing point. There is no 

 place in the Philippines, 

 at whatever altitude, 

 where some of these 



i 11 , i FK;. 118. Orange 



should not thrive. 



Soil. To permit the best growth, the soil must be 

 fairly light, and without standing water within 150 cm of 

 the surface ; but most of the roots do not run deeply. 

 The soil should be rich in potassium, and especially so 

 in lime. No other tropical fruit endures dry air so well 

 as these do, if they arc irrigated. 



FIG. 119. Lemons 



Propagation and Cultivation. The finer citrus fruits 

 are reproduced by grafting. The seed of some strong and 

 hardy kind is planted, and on the stem of the seedling a 

 small branch of the desired variety is grafted, (irafting 

 not only makes certain the kind of fruit that will be pro- 

 duced, but also gives a plant that produces two or more 



