. Nature-study; a manual for teachers and students. Nature study. 364 NATURE-STUDY vided with wing-like devices for dispersal, or else tlie seeds are thus provided. Elm and maple fruits have wings. The seeds of the catalpa have feathery wings, and the cotton- wood seeds are covered with a mass of down. Seeds and fruits of trees also float upon the water and may be thus scattered. Through the agency of man, orchard and shade. Fig. 155. White Elm in Flower. trees are planted, and on our originally treeless prairies there are now on nearl}' e\'ery farm planted groves. Trees, like other plants, ar
. Nature-study; a manual for teachers and students. Nature study. 364 NATURE-STUDY vided with wing-like devices for dispersal, or else tlie seeds are thus provided. Elm and maple fruits have wings. The seeds of the catalpa have feathery wings, and the cotton- wood seeds are covered with a mass of down. Seeds and fruits of trees also float upon the water and may be thus scattered. Through the agency of man, orchard and shade. Fig. 155. White Elm in Flower. trees are planted, and on our originally treeless prairies there are now on nearl}' e\'ery farm planted groves. Trees, like other plants, are dependent upon temperature, moisture, light, and soil. Temperature is one of the chief conditions determining the distribution of species. Conifers as a class prefer the colder northern regions or the higher altitudes on mountains. There are, however, southern and lowland species. The deciduous hardwood trees also abound chiefly in the colder temper?te regions. Some, like the wil-. 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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