Moreover, about 100 bulls and 1,600 cows and heifers are exported every year,[78] so that by this time, as was remarked in an American paper, there are more Jersey cows in America than in Jersey Island. Jersey milk and butter have a wide renown, as also the pears which are grown in the open air, but each of which is protected on the tree by a separate cap, and still more the fruit and vegetables which are grown in the hothouses. In a word, it will suffice to say that on the whole they obtain agricultural produce to the value of £50 to each acre of the aggregate surface of the island. * * * * * Fifty pounds’ worth of agricultural produce from each acre of the land is sufficiently good. But the more we study the modern achievements of agriculture, the more we see that the limits of productivity of the soil are not attained, even in Jersey. New horizons are continually unveiled. For the last fifty years science--especially chemistry--and mechanical skill have been widening and extending the industrial powers of man upon organic and inorganic dead matter. Prodigies have been achieved in that direction. Now comes the turn of similar achievements with living plants. Human skill in the treatment of living matter, and science--in its branch dealing with living organisms--step in with the intention of doing for the art of food-growing what mechanical and chemical skill have done in the art of fashioning and shaping metals, wood and the dead fibres of plants. Almost every year brings some new, often unexpected improvement in the art of agriculture, which for so many centuries had been dormant. We just saw that while the average potato crop in the country is six tons per acre, in Jersey it is nearly twice as big. But Mr. Knight, whose name is well known to every horticulturist in this country, has once dug out of his fields no less than 1,284 bushels of potatoes, or thirty-four tons and nine cwts. in weight, on one single acre; and at a recent competition in Minnesota 1,120 bushels, or thirty tons, could be ascertained as having been grown on one acre.