18 BULLETIN 748, U. S. DEPARTMENT OF AGRICULTURE. 



two horses. On 43 per cent of the farms a 1-man and 3-horse crew 

 was used. The crew of one man and two horses predominated in 



. "St. , ,T, . ~ 



Fig. 10. — A crew of one man and six horses operating a spring-tooth harrow. More 

 horses are used here than in the average crew. (See Table IX.) 



the Caro and Alma districts, while the 1-man and 3-horse crew was 

 in the majority in the Grand Rapids and Ohio districts. 



ROLLING PRACTICE. 



Two general types of rollers were found in these districts; the 

 solid smooth drum roller (fig. 11), either steel or wood, and the bar 



Fig. 11. — Rolling with a smooth drum roller. This type crushes clods and leaves a 



smooth surface. 



roller or pulverizer, (fig. 12). Two hundred and thirty-one smooth 

 iron, 37 bar, and 18 wood rollers were reported. The average width 

 of these implements was about 8 feet. (See Table X.) 



