PSANBltOaAMlA. 



277. 



the Apetalse also the -world is indebted for that exceedingly 

 valuable substance, India-rubber, which is obtained from 



Fig. 164.— Potato, 



Fig. 155.— Flax. 



the milky juice of several tropical trees related to the 

 Nettles and the Spurges. 



