Viticulture is commercially important in several other regions than those outlined. Thus, in the valley of the Hudson River, grapes have been grown commercially for nearly a hundred years, the industry reaching its height between 1880 and 1890, when there were 13,000 acres under cultivation. For some years, however, grape-growing along the Hudson has been on the decline. Another region in which viticulture reaches considerable magnitude is in several islands in Lake Erie near Sandusky, Ohio, the product going largely for the manufacture of wine. At one time grapes were grown commercially on the banks of the Ohio River about Cincinnati and westward into Indiana. The industry here, however, is a thing of the past. Another region in which grape-growing was once of prime importance but now lags has its center at Hermann, Missouri. The newest grape-producing area worthy of note is in southwestern Michigan about the towns of Lawton and Paw Paw. A small but very prosperous grape-growing region has its center at Egg Harbor, New Jersey. Ives is the mainstay among varieties in this region. In the southern states, Muscadine grapes are grown in a small way in every part of the cotton-belt and varieties of other native species are to be found in home vineyards in the upland regions, but nowhere in the South can it be said that grape-growing is a commercial industry. THE DETERMINANTS OF GRAPE REGIONS Climate, soil, site, the surface features of the land, insects, fungi and commercial geography are the chief factors that determine regions for money-making in grape-growing. This has been made plain in the foregoing discussion of grape regions, but the several factors must be taken up in greater detail. To bound the regions is of less importance than to understand why they exist--less needful to remember, more needful to understand. From what has been said, the reader has no doubt already concluded that successful grape-growing is in largest measure due to kindliness in climate. _Climate_ Under the assumption, then, that climate, of all factors, is chief in playing providence to the grape, let us examine somewhat critically the relations of climate to grape-growing. When analyzed, the essentials of climate, as it governs grape-growing, are found to be six: first, length of season; second, seasonal sum of heat; third, amount of humidity in summer weather; fourth, dates of spring and autumn frosts; fifth, winter temperature; sixth, air currents. _Length of season._