30 Entomology and Zoology Department. [Bull. 168 



premises, but prevents that injury to the grass roots which 

 would otherwise have resulted, and makes the lawn always ap- 

 pear sightly. A practical and substantial roller for this pur- 

 pose may be made of cement, with gas-pipe axle and handles. 

 It should weigh about 200 pounds. 



Types of lawn rollers made of cement, with gas-pipe axle and frame. The form for 

 setting the cement may be of wood, very narrow slats, or of galvanized iron. In the 

 latter case the form may be left on the roller. The dimensions of the roller should be 

 about 20 inches long by 14 inches in diameter. 



