while others lie dormant has been pursued more actively for rural zones than for urban. Thus Sauer (1952) devoted his Bowman Lectures to the problem of agricultural hearths in both the New World and the Old and his findings. controversial though they may be, have stirred up interest and debate on this topic. Spencer and Horvath (1%3) have also inquired into the origins of three modem but distinctiveagricultural zones. the North American 'Corn Reit', the Philippine 'Coconut Zone, and the Malayan 'Rubber Zone'. It is an