Again, p. 401—“Experiment with horses.—Jerusalem potatoes are held excellent food for the horse; they are eaten greedily, and he thrives on them. In this second experiment 30.8 pounds of Jerusalems cut into slices were substituted for eleven pounds of hay, the same theoretical equivalents being assumed for them as for the common potato. The ration now consisted of hay, eleven pounds; straw, five and a half pounds; oats, seven and a half pounds, and Jerusalem potatoes, 30.8 pounds. Having been accustomed to this regimen for some days, the teams were weighed, and having gone on for eleven days, they were weighed again: _Team No. 1._ _No. 2._ _Both Teams._ _Mean per horse._ In eleven days, gain 55 loss 33 gain 22 gain .9 “A result which leads to the conclusion that the equivalent assumed for the Jerusalem potato was correct; the animals had done their work, and gained one with another nine-tenths of a pound in weight.” Again, p. 406.—“One hundred pounds of good meadow-hay may be taken, as ascertained by experiment, to be equivalent to 280 of Potatoes, by analysis equal to 315 280 of Jerusalems, ” ” 311 400 of Beets, ” ” 548 400 of Swedes (too little), ” ” 676 400 of Carrots, ” ” 382 Again, p. 415.—“One thousand parts (by weight) of the forage gathered at Bechelbroun in its ordinary state contained: _Mineral _Azote._ _Phos. _Lime._ _Bone Substances._ Acid._ Earth._ Potatoes, 9.64 3.70 1.09 .17 .33 Beet, 7.70 2.10 .46 .54 .95 Turnip, 5.70 1.30 .35 .62 .72 Jerusalems, 12.47 3.75 1.35 .29 .53 Again, p. 449.—“Seventh experiment—with a cow two hundred and ninety days after calving.—In this trial the ration consisted of Jerusalem potatoes equivalent to thirty-three pounds of hay, under which the milk may be said to have remained stationary, though it was above rather than under the six pints per diem, as in the sixth experiment,” (with Irish potatoes).