278 LUTHER BURBANK 



Drainage is really a science in itself, and there 

 is not enough space here to give a full discussion 

 of it. There are a number of good books 

 upon the subject, however, and the names of 

 these will be found in the chapter on reference 

 literature. 



Before the system is installed, some com- 

 plete treatise on drainage should be thoroughly 

 studied. 



In some cases it is possible to secure the aid of 

 a person who has had experience in laying drain 

 tiles, and where this is possible it is the best plan. 



Supplying Water 



Irrigation is closely allied to drainage. The 

 two systems are for a similar purpose— to regu- 

 late the amount of moisture in the soil for plant 

 growth. 



Irrigation is needed in locations where there 

 is not sufficient rainfall to insure the growth of 

 certain crops. In many places also where the 

 rainfall is sufficient but not well distributed, irri- 

 gation will be profitable, especially in seasons of 

 unusual drouth. 



For large tracts such as orchards and extensive 

 seed and vegetable gardens, the common prac- 

 tice is to run water in large ditches with a system 

 of smaller ditches throughout the field. 



