COMMERCIAI PRODUCTS 



459 



Camphor comes from the camphor tree. The wood of the 

 tree is cut into small bits and heated with water. As a medicine 



FIG. 326. Gathering sap from rubber trees. 



camphoi is very valuable, and as a protection against insects 

 it has some value. 



Maple sirup is obtained from the hard or rock maple tree in 

 much the same way that turpentine is obtained from the pine. 

 The thin watery sap which runs from the tree is boiled down until 

 it thickens into sirup or hardens into sugar. 



