Pomona College Journal of Economic Botany 



129 



clear idea of the two fundamental principles of permanent avenue building: 1, the 

 establishment of a solid roadbed, and 2, suitable uniform and permanent border 

 plantings of trees. These roadbeds are built on well made foundations of crushed 

 stone, and once in their finished form, are kept constantly in perfect order by sec- 

 tion crews, just as our railways are worked. In sharp contrast to such a method 

 is ours of neglecting a well-built avenue until it is in such bad condition that 



Figure. 51. A Cuban country avenue in winter. Note the large dark pods of 

 Enterolobium and the long slender pods of Pithecolobium saman. In this case a 

 fine uniformity of result is obtained even with a mixture, on account of the striking 

 resemblance in form and habit of the two trees employed. 



