FORESTRY. 167 



It has been found that large quantities of cheap and avail- 

 able species of woods can be substituted for spruce in the ground- 

 wood process for news print paper. 



A test of the physical properties of timber has determined 

 the uses to which it may be placed to the greatest advantage 



economically. 



PROBLEMS. 



1. If the land area of the 48 states of the Union is 1,908,428,000 

 .acres, and there are approximately 500,000,000 acres in forests, what per 

 cent of the total area is in forests? 



2. How many square miles of forests are there in the United 

 States? 



3. The area of the forests in the United States are how many times 

 as large as your own state? 



4. How many acres of forests in your state? (See Bulletin 83, 

 Porest Service, U. S. Dept. of Agriculture.) 



5. What per cent of the land area of your own. state is in forests? 



Write to your state experiment station for bulletins on 

 forestry, preservative treatment of timbers, treatment of forest 

 trees, reforestation, commercial forestry, etc. 



Read instructions for planting catalpa seeds in the "Nur- 

 sery Planting Table for Forest Trees", in the chapter on "Plan- 

 ning and Adorning the Farmstead and School grounds". 



Catalpa has been planted under such a wide range of con- 

 dition that there has been a wide difference in results. The suc- 

 cess of catalpa raising will depend upon the following points : 



1. A suitable site for planting. 



2. Proper spacing. 



3. Proper cultivation and care. 



Study carefully instructions given by the National Govern- 

 ment. 



Catalpa Trees. 



Investigations made by the U. S. Government as reported by 

 Gifford Pinchot, in Circular 82 U. S. Dept. of Agriculture, Forest 

 Service shows the returns that may be expected from plantations 

 of hardy catalpa under a variety of conditions in different states. 



PROBLEMS. 



1. Two plantations in Marion Co., Mo., in which the trees were 

 spaced 4 by 8 feet when set out, contained at the end of 20 years, respec- 



