INDEX 



878 



Volcanic soils, i6 

 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 canescens, 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, IS3 

 Yautias, 155 

 Ylang-ylang, 255 

 Yucca Alamentosa, 190 



Zapupe, 172 

 Zebra, 334 

 Zebroids, 334 

 Zebu, 327 

 Zedoary, 252 

 Zingiber oMcinale, 249 

 Zizyphus jujuba, 135 

 vulgaris, 136 



(1) 



