Taking any good herd of Jersey cows, old and young, from the time the heifers first come in milk, and it will average to make two thirds as many pounds of butter per annum as any person in New England can make in pounds of beef, on any herd of any breed. The beef is worth six to nine cents, and the butter from twenty to forty cents. Furthermore, every farmer should know what the difference is in the actual value of the different cows he owns, rating their value upon the money he gets for their product. An ordinary cow will make about two hundred pounds of butter a year. The tables are intended to show what the difference is in the value of different cows for producing butter, taking as a basis the payment of thirty dollars for a cow that will make two hundred pounds of butter per annum, and for different amounts up to six hundred pounds per annum, assuming that the cow will die at twelve years of age. The interest upon the first cost of the cow, and on her product for each year, is compounded at the rate of six per cent. per annum, up to the day it is assumed the cow will die, taking no account of the value of the stock bred from her. As long as every business is done upon the basis of interest on investments, we must treat the question of values as applied to cows on that basis. This is the only way to accurately prove the difference in value between one cow and another. Table A. If the cow cost thirty dollars, the keeping per annum twenty-five dollars, and the butter sells for twenty-five cents a pound, the _profits_ on the cows will be as follows, viz: Paying $30 00 for a 200 pound cow, he will get in ten years, $170 00 ” 189 97 ” 300 ” ” ” 235 03 ” 348 86 ” 400 ” ” ” 299 89 ” 504 39 ” 500 ” ” ” 363 11 ” 671 61 ” 600 ” ” ” 428 39 Table B. _Including interest_ on all items, a farmer will make on each cow as follows, (made on a basis of twenty-five cents a pound for butter, and twenty-five dollars a year for keeping,) viz: Paying $30 00 for a 200 pound cow, he will get in ten years, $195 73 ” 125 00 ” 300 ” ” ” 313 06 ” 250 00 ” 400 ” ” ” 374 15 ” 350 00 ” 500 ” ” ” 474 52 ” 450 00 ” 600 ” ” ” 595 91 Table C. Reckoning the annual cost of keeping at thirty-five dollars, and butter at thirty cents a pound, _reckoning interest_ on her cost, and on all receipts from her, a farmer will make on each cow as follows, viz: