Italian rye-grass, beans, peas, mangolds, carrots, broccoli, cabbages, savoys, beet-root, Batavia yams, Jersey cabbages, and Indian corn, have all grown with wonderful rapidity and yielded abundant harvests under the stimulating and nourishing influence of the Romford sewage. The visitors of Saturday last, as they tramped over the farm under the guidance of its energetic proprietor, had an opportunity of witnessing the abundance and excellence of many of these crops. Even where the mangolds, from being planted late, had not attained any extraordinary size, it was noticeable that the plants were especially vigorous, and that there was not a vacant space in any of the rows. All the plants which had been placed in the ground had thriven, and would give a good return. Where this crop had been specially treated with a view to forthcoming shows, the roots had attained an enormous size, and, like some of the cabbages, had assumed almost gigantic proportions. The carrots were very fine and well-grown, and the heads of the Walcheren broccoli were as white, and firm, and crispy, as the finest cauliflowers; while the savoys, of unusual size and weight, were as round and hard as cannon balls; and some of the drumhead cabbages, although equally distinguished for closeness and firmness, were large enough in the heart to hold a good-sized child, and might, as was suggested upon the ground, very well be introduced into some pantomimic scene representing the kingdom of Brobdingnag. The Indian corn had reached the respectable height of some eight feet, and, with few exceptions, each stalk carried a good-sized and well-filled cob or ear. These, unless we should have another spell of exceptionally hot weather, will not ripen; but in their green state they are readily eaten by horses and cattle, and prove excellent fodder.