Air currents are of minor importance compared with the other factors discussed yet are worthy of attention. They are chiefly of importance in grape-growing in the suppression of fungi. It has long been noticed that in regions where there are strong currents of air the dreaded black-rot and the mildew are not nearly so harmful. Winds may be beneficial, too, when they bring warm air, when moisture laden, when they keep frosty air in motion, and possibly they have an effect on some small insects as the leaf-hopper. On the contrary they may be detrimental when too dry, strong or cold. Natural or artificial windbreaks may greatly modify the effects of wind currents though their value is usually overestimated as their benefits are often offset by the undesirable conditions caused. Lastly, the prevalence or lack of insects and fungi in a region may decide its value for viticulture. In several instances flourishing viticultural industries have been destroyed in this country by insects or fungi, or both. In other regions the present supremacy of commercial grape-growing is almost wholly due to the fact that neither insects nor fungi are seriously troublesome. The advent of spraying and a better knowledge of the life histories of insects and fungi are lessening the importance of the parasite factor in determining the value of a region for grape-growing, but it is still of high importance. We are now prepared to take up a discussion of the grape regions of New York. The states in which the growing of American grapes takes the rank of an industry are, according to the census of 1900, in order of production: New York, Ohio, Pennsylvania, Michigan, Illinois, Indiana, Kansas, Missouri, Georgia and Oklahoma. The value of the product in the leading state was $2,763,711; in the last named state, $128,500. American viticulture, so far as native grapes are concerned, is almost wholly confined to twelve states. But viticultural interests are still further localized. In New York the industry is divided into four great regions, the Chautauqua district, the Central Lakes district, the Hudson district, and the Niagara district. In Pennsylvania and Ohio grape-growing is largely confined to the shores of Lake Erie; in Michigan to a small district about the towns of Lawton and Paw Paw; in Missouri, Hermann is the representative point for grape culture. THE CHAUTAUQUA DISTRICT.