Soine authorities, among whom is Professor Wagner, divide erop growth into two very distinctly inarked classes. They are the nitrogen gatherers and nitrogen consumere. Except a small amount of nitrogen in the soü to start the growth, the nitrogen gatherers draw all their supply from the atmosphere. It is therefore waste to snpply nitrogen to these crops. The nitrogen consumere draw no perceptible amount of nitrogen from the atmosphere, but take it all up throusrh the soil, and nitrogen must be applied to the soil or furnished to the soil by some other means. It may be through the roots and stabble of a previous nitrogen gathering erop, or by the direct application of nitrates. All crops require potash and phosphoric acid, and in some cases it may be necessary to supply lime. Henee all soils should be fertilized with these three ingredients until they contain so much that any addition makes no perceptible increase of erop. A soü so charged is in a maximum condiüon. A system of rotation should be adopted that will give alternately a nitrogen gathering erop and a nitrogen consuming erop, and there will be very little demand for the application of nitrates, as the nitrogen gatherinp; erop will each time furnish the requisito amount of nitrogen for the following nitrogen consuming erop. In this way nature ia made to furnish to the soil the most costly of all fertilizers. Such is the theory. Now, what orops are nitrogen gathering? The answer is, all the leguminous plants - as peas, beans, clover, ludins, seradella, lentils, esparsetta, etc. What crops are nitrogen consuming? Answer: All the cereals, the grasses, and some, if not all, of the roots, fruits, etc., including maize and potatoes, wheat, rye, oats, barley and so on. The proper rotation of these two classes of crops, if the soil is well supplied with potash, phosphoric acid and lime, is supposed to secure the maximum crops and the most economical fertüization - both the crops and the economy to be enhanced by a careful and judicious saving and application of all available fertilizing material on the farm.