University Lectures Delivered By Members of the Faculty in the Free Public Lecture Course
University Lectures Delivered By Members of the Faculty in the Free Public Lecture Course
University of Pennsylvania
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This question is just beginning to be investigated from the point of view indicated. According to the biological theory today almost universally accepted, the most important part of the germ cells is the chromosomes, assumed to be chiefly made up of germ plasm. Omitting certain qualifications it is the germ plasm that carries the internal factors of development. Germ plasm is not, how- ever, the product of the organism in whose germ cells it resides, though it is nourished and grows at the expe...nse of that organism. It is a specific organized substance which every organism at the beginning of its life received from its parents and the latter again from theirs, and so back indefinitely. It may be thought (143) Digitized by Google University of Pennsylvania Public Lectures of as flowing as a continuous stream through the germ cells of successive generations, a portion of it being set apart in these germ cells at the same time that another portion pla}^ its part in the development of the body of the individual which bears the germ cells.
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