PRACTICHL 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. 
