xii LIST OF ILLUSTRATIONS 



FACE 



" ROSE DE MAIAYA " SWEET POTATO . . . .81 



SWEET POTATOES . , . . . To face page 82 



RAMPION . . . . . . . 85 



RHUBARB STALKS . . . . . . 88 



GOLDEN THISTLE . . . . , . . . 91 



SCURVY GRASS . . . . . . 93 



SKIRRET . -95 



COMMON BROAD-LEAVED FRENCH SORREL . . . 98 



ETAMPES YELLOW SOY BE^N . . . , . icz 



CHINESE YAM . . . . . - . 106 



YAMS ...... To face page 106 



