The gentlemans recreation in two parts : the first being an encyclopedy of the arts and sciences ... the second part treats of horsmanship, hawking, hunting, fowling, fishing, and agriculture : with a short treatise of cock-fighting ... : all which are collected from the most authentick authors, and the many gross errors therein corrected, with great enlargements ... : and for the better explanation thereof, great variety of useful sculptures, as nets, traps, engines, &c. are added for the taking of beasts, fowl and fish : not hitherto published by any : the whole illustrated with about an hundred ornamental and useful sculptures engraven in copper, relating to the several subjects.

ADDITION.

HAving placed the Vnites of the respective Progressions in Ranks and Files: begin and add together the Vnites of the Right-Hand File, setting down the Sum underneath (if it be under 10), but if just 10, then set down a Cipher (viz. 0) and carry 1 to the next place, and if above 10, set down the Excess, and carry for every 10 an Vnite. 〈 math 〉〈 math 〉

The reason of this is nothing else than all the Parts added together make up the Whole, as in the Line a, c, a, b, (14), and b, c, (24), together make the Line 〈 math 〉〈 math 〉

The best proof of Addition is thus; After you have added all the Numbers, cut off the first Line, and then add the rest; then Subtract the one Product from the other, and the Remain∣der is equal to the upper Number, for the Pro∣duct of the one Addition is lesser than the other by the First Number only, therefore their differ∣ence must be equal to the First Number.

In Numbers of divers Denominations, when the Sum of them amounts to an Integer, or Integers of the next greater Denomination, add these In∣tegers to those of the next Denominations.

4 Farthings make a Penny; 12 Pence, a Shil∣ling; and 20 Shillings a Pound.

7 92-/100, Inches make a Link; 160 square Links a Pearch; 40 Pearch a Rood; and 4 Rood an Acre.