Tomato seed of early varieties should be started under glass. The seed is sown on heat and the plants once or twice transplanted, and put in the open ground as soon as danger of frost is over. Little is gained by setting out too early, when the ground is cool. The tomato is of tropical origin, and makes rapid growth only at a temperature of 65° or upward. Indeed, it is suspected that one of the worst diseases to which the tomato is liable, the blight, is encouraged, if not wholly caused by too early planting in the open ground. =Varieties and Planting.=--At 4 feet apart each way, it will require about 2,700 tomato plants for an acre of land. In open field culture the tomato is always allowed to lie upon the ground. In garden culture, it is often tied to stakes or supported on trellises. Three ounces of seed will raise sufficient plants for an acre. There are many varieties of tomatoes, including the early and late market sorts, the yellow kinds, and the little pear-shaped and plum-shaped tomatoes, both red and yellow, used in pickling. The ideal market tomato is one of medium size and smooth shape. It must have firmness and depth, and the quality of ripening evenly all over. There should be neither greenness nor wrinkles around the calyx, nor should the fruit be of irregular shape. As to color, it is a matter of taste and neighborhood preference. Some markets demand red and some purple fruit. TOMATO.--We recommend, for earliest, Atlantic Prize and Money Maker; for second early and main crop, Brinton's Best, New Fortune; for late, Brandywine, Cumberland Red, Stone. For descriptions, see "Johnson & Stokes' Garden and Farm Manual." =Successional Planting.=--If the first tomato plants be set in the open ground (at Philadelphia) May 15th to 20th, there should be at least one and preferably two later crops, because young, vigorous plants yield the most and best fruit. It is good practice to sow tomato seed in the open ground, say about middle of May, and again somewhat later. These out-of-door plants will come forward very rapidly, and will be ready to produce late summer and autumn crops. [Illustration: Atlantic Prize Tomatoes, as they Appear for Sale on Fruit Stands, etc., during the Spring Months.] =Cultivation.=--The tomato is of the easiest cultivation, and will grow even under neglect, but it so abundantly repays attention, that no farmer can afford to be careless about the matter. The nights of May are cool in the North, and the newly-set plant at first makes little growth. Cultivator and hand-hoe should both be kept in motion during this period, and in June also. In the latter month the tomato will make a sudden leap toward maturity, and will yield ripe fruit in July. The out-of-doors cropping season lasts for three full months. The tomato is now grown under glass almost everywhere, and is to be had in the market during all the months of the year.