. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 459 tion is an economical arrangement of tissues often to be seen. It is noteworthy that these green fruits are often protected by bitter, acrid juices and poisonous properties that finally give place to attractive flavors, odors and colors, variations that are of considerable assistance to seed protection and Fig. 319. Fruit of the maple: A, mature fruit of red maple {Acer rubrum). B, schizocarp of Norway maple. The fruit split in half is still attached to the receptacle by delicate stalks. Many of the members of
. Nature and development of plants. Botany. DEVELOPMENT OF PLANTS 459 tion is an economical arrangement of tissues often to be seen. It is noteworthy that these green fruits are often protected by bitter, acrid juices and poisonous properties that finally give place to attractive flavors, odors and colors, variations that are of considerable assistance to seed protection and Fig. 319. Fruit of the maple: A, mature fruit of red maple {Acer rubrum). B, schizocarp of Norway maple. The fruit split in half is still attached to the receptacle by delicate stalks. Many of the members of this order contain acid or poisonous juices, as in the scarlet fruit of the sumac, which were a source of acetic acid to the early settlers of this country, or poisonous oils, as in the poison ivy or poison oak {Rhus radicans) and' the poison sumac (i?. Vernix). The former species is a climbing vine or sometimes a shrubby plant with leaves divided into three leaflets and with nut-like fruits (Fig. 320, B), while the poison sumac is an erect coarse shrub ten to fifteen feet high, with large pinnate leaves with reddish petioles and fruit clusters, as in the poison ivy (Fig. 320, A). Both of these plants contain volatile oils that cause the poisoning. The oil may readily be removed by washing in water containing baking soda, which saponifies the . oil, or in alcohol which dissolves it. With alcohol the washing must be thorough in order not to spread the infection. Applica- tions of alcohol containing sugar of lead (50 or 70 per cent, alcohol) are also recommended, which treatment is followed by. 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 Curtis, Carlton Clarence, 1864-1945. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, bookpublisher, booksubjectbotany
