Chap. XXI. Of the Wheat-Drill 3 7 f 



But when Two different Sorts of Seed are planted, 

 fuppofe a Row of St. Foin betwixt every Row of 

 Barley, the Rows of which being Eight Inches afunder, 

 and the Barley drilPd by the fore Hopper into the 

 Chanels made by the five Shares, and the St. Foin 

 drill'd from the hinder Hopper into the Chanels 

 made by Six Shares, the Marking-wheels mull beat 

 no greater Diftance than thofe above-mention'd, where 

 there are only Five Shares ; becaufe one of the Six, 

 which are for the St. Foin, muff always return in the 

 fame Chanel, going twice therein ; for One Row of 

 Barley would be miffing, in cafe the parting Space 

 mould be made by this Sixth Share ; and that parting 

 Space would have no Barley in it. Therefore it is 

 a Rule, that whenfoever Two Sorts of Seeds are drill'd, 

 the Rows of one Sort betwixt the Rows of the other 

 there mud be an odd Share in the Drill, which mud 

 go twice in one Chanel, and the Diftance of the Mark- 

 ing-wheels muft be accounted from that Rank of 

 Shares which are the feweft : It muft alfo be contriv'd 

 in this Cafe, that each outermoft Seed-box muft de- 

 liver but half the Quantity of Seed that each of the 

 inner Seed-boxes do : becaufe the outer ones going: 

 twice in a Place, their Chanels would otherwife have 

 a Quantity of Seed double to the reft. 



In a Drill that has Two Spindles, we place the 

 Marking-wheels on the foremoft, which upon their 

 Account is the longeft ; but if we mould ufe the 

 Wheels of the hinder Spindle as Marking-wheels, 

 then that muft be the longeft, and fo the fore Wheels 

 ftheir Semidiameters being much longer than the 

 Semidiameters of the hinder Wheels, and their Spin-i- 

 dles fhorter) would ftrike againft the hinder Spindle, 

 unlefs it were fet farther back than is convenient. 



When Ground is harrow'd the laft time before it 

 is to be drill'd, we contrive that the Harrows may not 

 go directly towards the fame Point that the Drill is 

 to go, left the Track of the Marking-wheel mould 



B b 4 be 



