The next six plots had received very heavy dressings of ammonia-salts, with superphosphate, potash, soda, and magnesia. He examined them with the greatest interest. “What have you here?” he asked, while he was examining 5_a_, which afterwards turned out 37¼ bushels per acre. --“Potash, soda, epsom-salts, superphosphate, and ammonia--but it is the ammonia that does the good.” He passed to the next plot, and was very enthusiastic over it. “What have you here?” --“Rape-cake and ammonia,” said I. --“It is a grand crop,” said he, and after examining it with great interest, he passed to the next, 6_a_. --“What have you here?” --“Ammonia,” said I; and at 6_b_ he asked the same question, and I replied “ammonia.” At 7_a_, the same question and the same answer. Standing between 7_b_ and 8_a_, he was of course struck with the difference in the crop; 8_a_ was left this year without any manure, and though it had received a liberal supply of mineral manures the year before, and minerals and ammonia-salts, and rape-cake, the year previous, it only produced this year, 3½ bushels more than the plot continuously unmanured. The contrast between the wheat on this plot and the next one might well interest a practical farmer. There was over 15 bushels per acre more wheat on the one plot than on the other, and 1,581 lbs. more straw. Passing to the next plot, he exclaimed “this is better, but not so good as some that we have passed.” --“It has had a heavy dressing of rape-cake,” said I, “equal to about 100 lbs. of ammonia per acre, and the next plot was manured this year in the same way. The only difference being that one had superphosphate and potash, soda, and magnesia, the year before, while the other had superphosphate alone.” It turned out, as you see from the table, that the potash, etc., only gave half a bushel more wheat per acre the year it was used, and this year, with 2,000 lbs. of rape-cake on each plot, there is only a bushel per acre in favor of the potash, soda, and magnesia. The next plot, 9_b_, was also unmanured and was passed by my father without comment. “Ah,” said he, on coming to the two next plots, 10_a_ and 10_b_, “this is better, what have you here?” --“_Nothing but ammonia_,” said I, “and I wish you would tell me which is the best of the two? Last year 10_b_ had a heavy dressing of minerals and superphosphate with ammonia, and 10_a_ the same quantity of ammonia alone, without superphosphate or other mineral manures. And this year both plots have had a dressing of 400 lbs. each of ammonia-salts. Now, which is the best--the plot that had superphosphate and minerals last year, or the one without?” --“Well,” said he, “I can’t see any difference. Both are good crops.”