. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. MAPLE-SUGAR MAPLE-SUGAE 429 Maple-sugar weather. Ideal sugar weather is met in the late winter or very early spring, when it begins to warm up, when the days are sunny and the nights still frosty. The gradual northern spring in which the ground yields up its frost but slowly is more likely to provoke the repeated sap-flows, which make a suc- cessful season, than the more frostl
. Cyclopedia of farm crops : a popular survey of crops and crop-making methods in the United States and Canada. Agriculture -- Canada; Agriculture -- United States; Farm produce -- Canada; Farm produce -- United States. MAPLE-SUGAR MAPLE-SUGAE 429 Maple-sugar weather. Ideal sugar weather is met in the late winter or very early spring, when it begins to warm up, when the days are sunny and the nights still frosty. The gradual northern spring in which the ground yields up its frost but slowly is more likely to provoke the repeated sap-flows, which make a suc- cessful season, than the more frostless seasons of more southern latitudes. Whatever the real cause of sap-flow, temperature fluctuations from points below to those above the freezing point, slight though they may be, excite the gas tension in the wood-cells if they occur before the leaf-buds get well started. After that yearly episode in the life of the tree, little or no sap flows, whatever the vagaries of the thermometer. If at this time the tree-trunk is tapped with an auger, an inch or two in depth, preferably on the south side, and a sap-spout driven into the hole, the sap flows. Convenience and economy alike dictate tapping at breast height. The flow is erratic, often exasperatingly so. It may run for some time fairly continuously, but commonly the flow is broken up into several distinct periods, or "runs" as they are called, until the over-warm weather of advancing spring swells the leaf-buds and the " season " is over. Sap runs in the daytime, rarely at night, and to any extent only on good sap days. The sap. The sap as it first flows is crystal clear and faintly sweet, carrying not only sugar but also minute quantities of mineral matters, albumens and gums; as the season advances the flow lessens, the sap clouds up (owing to exterior contamination of the pail or tap), becomes slimy at times and the quality be- comes impaired. Hence " first run " sugar or syrup makes the bes
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