ORGANIC EVOLUTION—THE FACTORS
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But, as we see, variations can only be reproduced in the offspring by exercise of it, since without stimulation the variations do not appear. Therefore Mr. Spencer and those who follow him virtually hold that the acquirement of variations by the parent causes an increased power of varying in the offspring; i.e. that when one thing is acquired, another thing, which is not acquired and is therefore not transmitted, appears in the offspring.
