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It now seems evident, from recently gathered data, that thesezones correspond very closely to belts of country which have similarplanting seasons for dormant woody plants, at least throughout thehumid regions east of the 100th parallel of latitude. By consulting theaccompanying Plate II, which has been adapted from the one inthe above-mentioned Bulletin, and also the chart (Plate III), whichshows the reported length of planting seasons, it will be seen that thestations reporting fall into groups which lie in respective life-zones asshown on the map. Thus stations 2, 3, 4, and 6, all of which lie in the so-called Transi-tion Zone, including most of New England, New York State, Penn-sylvania, northeastern Ohio, the Alleghanies from Pennsylvania toGeorgia, southeastern Ontario, Michigan, Wisconsin, southern Minne-sota, North Dakota, and northern South Dakota, all report a shortfall and spring planting season, divided by a long winter season,during which ordinary planting work is impracticable. Stations7, 8, and 10 lie in the northern limits of the upper Austral Zone wherethey are influenced by the Great Lakes. Stations 13,14,15, and 18 lieoutside of the Great Lakes influence in the same zone, which includes agreat territory stretching from the Coastal Plain westward to theGreat Plains, and from the Transition Zone on the north to centralGeorgia and northern Texas on the south, except for an arm of theLower Austral which extends northward along the Mississippi River toCairo, 111. The first three stations, 7, 8, and 10, show the influence ofthe Great Lakes in that their spring planting season is delayed, whilestations 13, 14, and 15 show a markedly later date for stopping trans- |
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