on Agricultvral ImplempMs, 



593 



of the land, be brougfht nearer together or spread wider apart, 

 exactly like the mimic soldiers on the child's toy. It is true 

 Mr. Coleman's harrow looks rather cumbrous; but on examina- 

 tion it is found to possess small, almost invisible, wheels, whicli 

 are easily let down, and serve to move the harrows from one field 

 to another. Tiiis is a further advantage, for a set of common 

 iron harrows must first be separated, and even then are trouble- 

 some enouo^h to convev. 



3. Rollers. 



Not many years since the landlord was often asked by his 

 tenant for some old tree to convert into a roller. The tree 

 roller, when manufactured, had its framev/ork loaded with rough 

 materials to give it weight. But it soon wore and cracked, so as 

 to produce in a year a most ungainly instrument. Som.etimes the 

 tree was manufactured into what was called a cheek-roll, that is 

 to say, a roll without framework, but with an iron peg driven into 

 each end, to which pegs the horse's traces were fastened. We 

 have now very excellent rollers with iron cylinders, which last for 

 ever ; but it does seem that for rendering the soil fine their regular 

 form has this disadvantage^ that they pass so 

 equally over small clods as merely to press, 

 not to grind them. A more squeezing mo- 

 tion seems to be wanted. Mr. Claes of Bel- 

 gium exhibited a roller intended for narrow 

 round ridges, but which seems to possess the 

 germ of this very squeezing motion which we 

 require. The roller consists, in its breadth, 

 of four separate rollers of equal size ; these 

 do not work on a fixed axle, but contain a central circle of 



