;]4i> 



mxpjuRiMHrfTS WITH plants 



duetioii of fiowt'i's and fruit. Land-plants growing in 

 unusually moist situations run to stem and leaf, and 

 produce flowers and fruit sparingly: on the 

 contrary, when gi'owing in unusually dry places, 

 the same plants produce relatively more abun- 

 dant flowers and fruit than usual. Such water- 

 plants as are descended from land-plants are, 

 as a rule, unable to flower or fruit under water 

 (Water Plantain, Arrowhead, Hippuris, etc.). 

 Gardeners induce plants to flower abundantly 

 by digging a trench around the base of the 

 trunk, and thereby cutting off numerous active 

 roots: another method is to simply lay the 

 roots bare. Cacti which are allowed to become 

 somewhat dry and shrunken bear more freely. 



Bending and breaking the branches of fruit 

 trees, which results in partially cutting off the 

 water supply, is practiced for the purpose 

 of causing trees to fi'uit. It also tends to 

 make the fruit sweeter and of higher 

 flavor. Fruit grown in the mountains 

 (where it is dryer and the light stronger) 

 is usually supei'ior in these respects. Over- 

 irrigation has a tendency to produce 

 watery fruit which is neither very sweet 



nor highly flavored.^ 197. Leaves of Oan- 



' . delion drawn on 



Ey knowmg lust when and how much to thesamescaie: (a) 



^ ^ " normal. (6) grown 



, 010 J oin in a saturated at- 



' See pages 318 and 319. mosphere. 



