INDEX 



373 



Volcanic soils, 16 

 Vulcanization of rubber, 193 



Wampi, 133 

 Water grass, 314 

 Water lemon, 132 

 Wattle bark, 230 

 Wax, 213 



Weeds, destruction of, by chemi- 

 cals, 27 



West Indian cedar, 295 

 White man as tropical farmer, 37 

 Wi apple, 138 

 Wikstrcemia cane sc ens, 188 

 Windbreaks, 25 

 Wind erosion, 6 

 Winds in Tropics, 3 

 Wine palm, 182 

 Winged bean, 311 



Wood oil tree, 264 

 Woods, 290-300 



Xanthosoma, 155 

 Xanthostemon, 293 



Yam, 153 

 Yautias, 155 

 Ylang-ylang, 255 

 Yucca filament osa, 190 



Zapupe, 172 

 Zebra, 334 

 Zebroids, 334 

 Zebu, 327 

 Zedoary, 252 

 Zingiber officinale, 249 

 Zisyphus jujuba, 135 

 vulgaris, 136 



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