207 
extends down to an altitude of 300 or 400 feet, below which 
limestone predominates and a different and more vigorous flora 
Fic. 25. Arroyo del Medio, near Woodfred, Oriente, Cuba. 
is encountered. There are also limestone hills of highe alti- 
tude in the region. 
The streams rising in the plateau and flowing northward are 
