. Biology; the story of living things. THE EPIC OF EVOLUTION SOS Hurst (1870- ), on the other hand, thought of the lines represent- ing the embryonic stages as divergent rather than parallel, since the farther back one traces r s*. ^l ^ 1 . ., ccdxjtity stages the ontogeny, the greater the — ^ resemblance between different , am^y,i>^ian5^, birds Imes. Morgan m reply sug- |i5>^s S^ reptlkS/ mammals gested that the reason for this "^ observation, indisputably true, may be because there are fewer available diagnostic features upon which to base differences the farther one goes back in
. Biology; the story of living things. THE EPIC OF EVOLUTION SOS Hurst (1870- ), on the other hand, thought of the lines represent- ing the embryonic stages as divergent rather than parallel, since the farther back one traces r s*. ^l ^ 1 . ., ccdxjtity stages the ontogeny, the greater the — ^ resemblance between different , am^y,i>^ian5^, birds Imes. Morgan m reply sug- |i5>^s S^ reptlkS/ mammals gested that the reason for this "^ observation, indisputably true, may be because there are fewer available diagnostic features upon which to base differences the farther one goes back in development. Finally, O. Hertwig (1849- 1922) has emphasized the fact that the different lines do not all start alike with the same egg stage. There are eggs and eggs. possibilities not attained by the fish egg. Thus, the eggs of the various groups, or "species-cells" as Hertwig calls them, have ac- complished an evolution in themselves and attained different levels mammals *-*^ possibility, with the result that the mammalian egg has a flying start over the fish egg, and be- comes in consequence an adult. 6 6 Morgan's " Repetition ; The mammalian egg has reptiles. 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 Hunter, George W. (George William), 1873-1948; Walter, Herbert Eugene, b. 1867; Hunter, George W. (George William), 1902-. New York, Cincinnati [etc. ] American book company
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