xvi SYLVICULTURE IN THE TROPICS 



FIG. 



83. Cycle of operations during rotation 



84. Rectification of boundaries . 



85. Monolithic boundary pillar 



86. Boundary cairn .... 



87. Burning of fire-trace .... 



88. Fire crossing the guide-line into the forest 



89. Ticket-patrol 



90. Fixation of dunes in France 



92. Splaying trees on unstable slopes 



93. Wattle-fence 



94. Revetment wall, terraced and planted . 



95. Training of watercourse on unstable slope 



96. Barrage of mountain torrent 



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