YAMS, COCOES, AND SWEET POTATOES. 163 
to have no stem at all, its leaves being held on 
high by very long stalks." 
''They are very pretty leaves, Uncle/' said 
Fred. " Their shape is just like a large arrow- 
head." 
The Sweet Potato Plant and Roots. 
9. ''They act in a pretty way too/' remarked his 
Uncle. " I think you know that all plants give 
off water from their leaves, although we cannot 
see the water passing away. The coco plant not 
only does this in the usual way, but from the tips 
of its leaves it sends off extra drops, which we 
