} 



PRACTICAL ARBORICULTURE 249 



"The Catalpa deflected three times as much as the ash or oak before 

 breaking. 



"Five thousand pounds pressure on blocks one inch square by three inches 

 long compressed : 



"Oak, 10-16 inch- oak, 10-16 inch; oak, 8-16 inch; catalpa, 7-16 inch; 



A GROUP OF CATALPA TREES 100 FEET HIGH 



catalpa, 9-16 inch; catalpa, 7-16 inch; white pine, 5-16 inch; Norway pine, 

 6-16 inch; white walnut, 5-16 inch; yellow pine, 6-16 inch; black walnut, 10-16 

 inch ; black walnut, 8-16 in ; ash, 14-16 inch ; ash, 6-16 inch. 



