. Principles of American forestry . Forests and forestry. 88 PRIXCIPLES OF AMERICAN FOUESTKY. freezing, while others require a much higher temperature. (6) After seeds of some plants have become very dry, scaldin^r may aid them jiLgerroiaaiing, while with others, scalding is ininrious. It is sometimes desirable to soak seeds for one or two days in teftid—Kai£r and then mix with sand and freeze before sowing. Lindley records that seeds found in raspberry jam grew after passing through the heat necessary to boil syrup (240 degrees Fahr.), and that seeds of Acacia grew after being boiled five min
. Principles of American forestry . Forests and forestry. 88 PRIXCIPLES OF AMERICAN FOUESTKY. freezing, while others require a much higher temperature. (6) After seeds of some plants have become very dry, scaldin^r may aid them jiLgerroiaaiing, while with others, scalding is ininrious. It is sometimes desirable to soak seeds for one or two days in teftid—Kai£r and then mix with sand and freeze before sowing. Lindley records that seeds found in raspberry jam grew after passing through the heat necessary to boil syrup (240 degrees Fahr.), and that seeds of Acacia grew after being boiled five minutes, but our common tree seeds will not stand such Fig. 20.—Cross-section of stratifying pit for storing seeds during T\'inter, covered with inverted sods. Stratification, as the term is used in this connection, refers to the storing of seeds mixed with layers of earth, leaves, or other material. It is customary to apply the term solely to seeds that are mixed in this way and kept frozen over winter. It is the common practice with the seeds of such trees as the Black Walnut, Hickory, Bass- wood, Plum, Cherry, and Mountain Ash. Where only small quantities are to be cared for they are generalh- mixed in boxes and the boxes buried in well-drained -s'lil. 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 Green, Samuel B. (Samuel Bowdlear), 1859-1910. New York, J. Wiley & Sons
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