. Animal biology. Biology; Zoology; Physiology. DEVELOPMENT OF BIOLOGY 469 (1834-1914) of Germany in a series of essays culminating in 1892 in his volume entitled The Germ, Plasm. He identified the chro- matin material which constitutes the chromosomes of the cell nucleus as the specific bearer of hereditary characters, and em- phasized a sharp distinction between germ cells and somatic cells. (Figs. 181, 305.) While this viewpoint had been gradually gaining content and precision, the science of genetics had been advancing not only by exact studies on the structure and physiology of the germ c
. Animal biology. Biology; Zoology; Physiology. DEVELOPMENT OF BIOLOGY 469 (1834-1914) of Germany in a series of essays culminating in 1892 in his volume entitled The Germ, Plasm. He identified the chro- matin material which constitutes the chromosomes of the cell nucleus as the specific bearer of hereditary characters, and em- phasized a sharp distinction between germ cells and somatic cells. (Figs. 181, 305.) While this viewpoint had been gradually gaining content and precision, the science of genetics had been advancing not only by exact studies on the structure and physiology of the germ cells, but also by statistical studies of the results of heredity — the various. Fig. 305. August Weismann. characters of animals and plants as exhibited in parents and off- spring. The studies of this type which first attracted the attention of biologists were made by Galton (1822-1911) of England. In the eighties and nineties of the last century, he amassed a great volume of data in regard to, for example, the stature of children with reference to that of their parents, and derived his well-known ' laws' of inheritance. But the work which eventually created the modern science of genetics was that of Mendel (1822-1884) of Briinn, Austria. Men- del combined in a masterly manner the experimental breeding of pedigree strains of plants and the statistical treatment of the data. 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 Woodruff, Lorande Loss, 1879-1947. New York The Macmillan company
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