. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 227 often detect the odor of gas in the cellar, as the gas will follow the ex- terior of the pipe leading into the cellar, and often escapes into sewers, underground conduits, hydrants, etc. Wells are often badly contami- nated even when located some distance away, and in the winter gas leakage becomes a source of danger to near-by greenhouses. There is considerable difference in the resistance of soils to gas. In gravelly soils we have known gas to travel 2,000 feet when the ground was frozen and escape into
. Bulletin - Massachusetts Agricultural Experiment Station. Agriculture. SHADE TREES. 227 often detect the odor of gas in the cellar, as the gas will follow the ex- terior of the pipe leading into the cellar, and often escapes into sewers, underground conduits, hydrants, etc. Wells are often badly contami- nated even when located some distance away, and in the winter gas leakage becomes a source of danger to near-by greenhouses. There is considerable difference in the resistance of soils to gas. In gravelly soils we have known gas to travel 2,000 feet when the ground was frozen and escape into the cellar of a house, while in heavier soils it is more likely to be restricted to smaller areas. It requires a considerable amount of gas to kill a large tree, although not so much as it would were 1 ~T - â tI i? 1 c E r| j 1 B D oJ D B i B =1 iâF. 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 Massachusetts Agricultural Experiment Station. Amherst, : Massachusetts Agricultural Experiment Station, 1907-1974
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