Sirs,-I shall feel obligated if one of your numerous intelligent correspondents, who has attended to the subject, will inform me, through the medium of your forum, the relative power required to draw a four-wheeled carriage and a two wheeled carriage, each containing a load of two tons-
1st, Over level ground
2nd, Over hilly ground
3rd, Through farm and parish roads
I am aware that much has been written in favour of each mode of conveyance, but I am not able from what I have yet read to arrive at a satisfactory conclusion.