VI PREFACE. 



from one yard in length to five hundred. This is another 

 mode of ascertaining the quantity of seed sown per acre ; 

 and the convenience of these tables will be very great, 

 in showing the quantity of corn, grain, roots, &c., grown 

 upon an acre ; for it is only to step off, in any average 

 part of the field, eleven yards square, and weigh or 

 measure the produce, and forty times that quantity will 

 be the exact product of an acre : thus, if a bushel of 

 barley, &c., be obtained from eleven yards square, the 

 crop per acre will be ten bags of four bushels each, or 

 forty bushels : then, by stepping the remainder of the 

 field, and turning to the tables, the product of the whole 

 field can be ascertained most easily. Again, if such a 

 piece of land namely, eleven yards square produce 

 three bags of potatoes, the produce per acre will be 

 one hundred and twenty bags. Beets, turnips, carrots, 

 parsneps, &c., may be weighed, and the quantity ascer 

 tained in a few minutes, by the same means. And when 

 a farmer intends to plough an acre of land for his day s 

 work, it is only to ascertain the length of the land by 

 stepping, turn to the table to find the width necessary to 

 form the acre, step that also, and place a rod at the spot ; 

 and he will derive much pleasure and interest from wit 

 nessing the progress which he is making towards the 

 fulfilment of his task. This plan can be adopted at the 

 time of harvest, creating great emulation amongst the 

 persons employed, particularly if bands of workmen are 

 engaged in different parts of the field; and in this way 



