Sixth.--Wind-breaks furnish small protection against cold to either trees or buds. The value of a wind-break depends largely upon the topography of the land. A wind-break so planted as wholly to check currents of air is detrimental so far as cold is concerned; so planted as to deflect the current of air they may become of value in keeping off frosts. More often than not, however, they seriously check atmospheric drainage and the damage by frost is greater. Seventh.--Young peach-trees suffer more than old trees, probably because the young trees do not mature their wood as well as the older ones. There are, however, many exceptions to the statement that young trees are less hardy to cold than old ones. Old trees are often forced to produce large quantities of new wood susceptible to winter-killing, while, on the other hand, the superabundant growth of young trees can be kept down by orchard-treatment. Old trees possessing low vitality are less hardy than vigorous, young trees. Thus, trees suffering from the ravages of borers, leaf-curl or other fungus troubles suffer most from cold. While young trees are more susceptible to freezing than old ones, yet they are much more likely to recover, if recovery be possible, and their return to a normal condition is more rapid. Eighth.--What degree of cold will kill peach-trees? Twenty degrees below zero under the best of conditions kills the peach. Depending upon the condition in which the trees begin the winter, however, the trees may be killed by any temperature between zero and -20°. The following are the conditions unfavorable to withstanding cold, in about the order of importance: Immaturity of wood; lack of protection of roots by snow or cover-crop; poor drainage; overbearing in the preceding year; lack of vitality from ravages of insects, or fungi or from infertility of soil; susceptibility of variety to cold. Ninth.--What degree of cold will kill peach-buds? Much depends upon the condition of the buds. Fifteen degrees below zero seems to be the limit that peach-buds can stand even when all conditions are favorable. The chief factors influencing tenderness of buds are maturity of buds, variety, and the time at which buds finish their resting period. Tenth.--Small-growing varieties with compact heads are hardier than the free-growing sorts with large heads. The following varieties are named as compact in growth and hence hardier than the average: Chili, Crosby, Gold Drop, Barnard, Kalamazoo, Triumph, Wager and Fitzgerald. Eleventh.--In New York the varieties Crosby, Chili, Stevens, Gold Drop and Elberta are named as most hardy in wood. As most tender in wood Early Crawford, Late Crawford, Chairs, St. John and Niagara are named. Crosby, Chili, Triumph, Gold Drop, Stevens and Kalamazoo are most hardy in bud. Early Crawford, Late Crawford, Chairs, Reeves and Elberta are most tender in bud.