Publisher's Synopsis
Excerpt from Memoirs of the National Academy of Sciences, 1896, Vol. 8
The work has extended over a period of ten months, with considerable interruption during much of the time.
Virgin soil was examined to a depth of 12 feet, samples having been obtained from the walls of an excavation at intervals of a foot. Samples of made soil were obtained in the same way to a depth of 9 feet. Other samples of both made and virgin soil were obtained by Frankel's earth borer to a depth of 55 feet.
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