606 IMPROVEMENT OF

from each other, the rows of wheat or beans will then be fown nine inches from each other; and as the wheels of the carriage are four feet in diameter, and therefore travel about twelve feet at each revo- lution; and as there are four excavations round the axis of the feed- box, which revolve four times for one revolution of the carriage- wheels; it follows, that the feeds contained in the excavations of the cylinder beneath the feed-box will be fown at nine inches dif- tance in each drill or furrow, as the plough proceeds; and as thefe rows are nine inches afunder, any defired number of feeds may be depoñted in every fquare of nine inches, which are contained in the furface of the field.

6. Mr. Coke of Norfolk acquainted me, that on his very exten- five farm the wheat fown'on an acre was fix or feven pecks by the Rev. Mr. Cook’s drill plough, which was about balf the quantity generally ufed in broad-caft fowing. Ifthe wheat was nicely depo- fited in the drills, I fufpeét one bufhel would be quite fufficient for an acre, as the rows are at nine inches diftant from each other; for there would in that cafe be about eight grains or nine grains depo- fited in every nine inches of the drill-furrow; that is, in every fquare of nine inches contained in the furface of the land fo cul- tivated.

Which may be thus eftimated. Mr. Charles Miller, in the Philo- fophical Tranfa&ions, Vol. LVIIT. p. 203, has eftimated the num- ber of grains in a bufhel of wheat to amount to 620,000; and Mr, Swanwick of Derby has lately eftimated them to be 645,000. We may fuppofe therefore, that a bufhel may at an average contain 635,000 grains of wheat. Now as a ftatute acre contains 4840 fquare yards, and there are fixteen fquares of nine inches in every fquare yard, 4840 multiplied by 16 gives 77,440, which is the number of fquares of nine inches in fuch an acre. If 635,000 grains in a bufhel be divided by 77,440, the number of fquares of nine inches in an acre, the.quotient will fhew, that rather more than

eight