. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. 82 HISTORY OP FARM standing, needing cutting. Fire was the cutting agent first employed. Trees were burned down by building fires about their bases, and then by similar process they were cut in sections. It was only for long-keeping fires that such fuel was needed: there was always excess of kindling-stuffs available for making qtiick fires. All wood will btun and give forth heat, but one who knows woods will not use all kinds: it is only the degenerate. Fig. 43. West
. The natural history of the farm; a guide to the practical study of the sources of our living in wild nature. Natural history. 82 HISTORY OP FARM standing, needing cutting. Fire was the cutting agent first employed. Trees were burned down by building fires about their bases, and then by similar process they were cut in sections. It was only for long-keeping fires that such fuel was needed: there was always excess of kindling-stuffs available for making qtiick fires. All wood will btun and give forth heat, but one who knows woods will not use all kinds: it is only the degenerate. Fig. 43. Western yellow pine dismantled and ignited by lightning (U. S. Bureau of Forestry.) modem, who will do that: who will go to the telephone and order a cord of wood without further specifications. Heavy, close grained, hard woods as a rule bum more slowly and yield more heat than the lighter more open-textured soft woods. Combustible resins vary the rate of burning, and the of heat produced: but the greatest differences in burning quaKties are due to the amount of water present. A punky old log that when dry will bum like tinder will soak up water like a sponge and, becoming "water logged," will not. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Needham, James G. (James George), 1868-1956. Ithaca, N. Y. , The Comstock Publishing Company
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectnaturalhistory, booky
