PRACTICAL AGRICULTURE. 



55 



of some kind of heavy wood, that they may operate 

 as a counter weight to the head, the soc, and the 

 mouldboard. 



To these remarks we subjoin two sets of experi- 

 ments, made with the most approved French and 

 English ploughs, that of Guillaume and Small's 

 Rotheram plough improved, which furnish a means of 

 comparison between the best ploughs of Europe and 

 those of this country. 



The resistance (stated in these tables) was meas- 

 ured and ascertained by a dynonometer, a machine 

 indispensable to those who would make correct ob- 

 servations on the relative advantages of different 

 ploughs. 



THE FRENCH PLOUGH. 

 Resistance in pounds. 

 1st experiment 



3d '. '. '. 



4th "... 

 5th . . . 



Average 



IL The Harrow. This is of different kinds ; the 

 triangular and the square, the single and the double. 

 But, of whatever form, its uses are the same ; to 

 smooth the field after ploughing, to break and pul- 

 verize the clods, and to cover the seed. These 

 uses sufficiently indicate the propriety of employ- 

 ing two in succession ; one of heavy frame, with 

 few and long teeth, like the Scotch break; the 

 other of lighter construction, with more and short- 

 er teeth. Our own experience leads us to believe 

 that the common harrow covers the seed too much, 



