. College botany; structure, physiology and economics of plants. Botany. PLANT EVOLUTION 241 the part of many people, especially the theologians, who believed that his theories eliminated Deity. In fact, Darwin's theories did not eliminate Deity, but they did emphasize the importance of natural laws. However, his theories were accepted by many scientists and eventually by educated people very generally. The principles of organic evolution as set forth by Darwin have had a more far-reaching influence than those of any other scientific worker. Darwin and his immediate followers were observers of
. College botany; structure, physiology and economics of plants. Botany. PLANT EVOLUTION 241 the part of many people, especially the theologians, who believed that his theories eliminated Deity. In fact, Darwin's theories did not eliminate Deity, but they did emphasize the importance of natural laws. However, his theories were accepted by many scientists and eventually by educated people very generally. The principles of organic evolution as set forth by Darwin have had a more far-reaching influence than those of any other scientific worker. Darwin and his immediate followers were observers of nature rather than experimenters, but in a very few years there arose a school O'l workers who insisted on proving or dis- proving theories by experimental evidence. This method has now spread to practically all branches of the biological sciences. Mendel.—Johann Gregor Mendel (Fig. 110) is a name well known to the students of heredity in plant and animal life. He was an Austrian monk who was interested in the breeding of plants and Mendel. 'cProm^Ga'ger's Fundamentals of Botany.) worked out certain laws oi heredity which bear his name. His results were published in an obscure publi- cation about 1865 and did not attract attention until about 1900, when they were brought to light by Correns, DeVries and Tschermak. They have had a very decided influence on the study of evolution. Mendel's work was primarily with peas, in which he always studied the inheritance of two contrasting characte^rs. Two plants with contrasting characters (such as long and short plants, smooth and wrinkled seeds, gray or brown seed coats, yellow or green cotyledons) were selected and oros&-pollinated. The seeds were carefully collected and planted throughout a. 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 Cook, Melville Thur
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