YAMS, COCOES, AND SWEET POTATOES. 
161 
dry. As they dry, the husks burst and shoot out 
their seeds, which are then collected, that the oil 
may be taken from them. 
6. In the West Indies this is often done by 
boiling the crushed seeds in water. This draws 
the oil from them, and as it will not mix with 
the water, but floats on the top, it can be easily 
skimmed off*. 
7. But in Europe and America the oil is pressed 
out by machines, and is then called cold drawn" 
oil. This is liked better than the kind that is 
drawn out by heat. 
8. You know that castor-oil is a drug, and that 
it is often used to make us better when we are 
ailing. It may also be put to other uses ; such 
as for burning in lamps, for oiling machines, and 
for the making of soap. As a lamp oil it burns 
slowly, gives a good white light, and is safe. 
THREE USEFUL VEGETABLES— YAMS, COCOES, 
AND SWEET POTATOES.— I. 
1. Before Fred and Harry Brown ended the 
visit to their uncle, they learnt many things about 
yams, cocoes, and sweet potatoes — three vege- 
tables which form a large part of the food of 
people living in the West Indies. 
( M 357 ) L 
