Darwin And After Darwin An Exposition of the Darwinian Theory And a Discussion
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All this, it will be noticed, is a case of cell-multiplication, which differs from that which takes place in the unicellular organisms only in its being in- variably preceded (as far as we know) by karyokinesis, and in the resulting cells being all con- fined within a common envelope, and so in not being free to separate. Nevertheless, from what has already been said, it will also be noticed that this feature makes all the difference between a Metazoon and a Protozoon ; so that already the ovum... presents the distinguishing character of a Metazoon.
FIG. 40. The contents of an ovum in an advanced stage of segmentation, drawn in perspective. (After Hackel. ) 136 Darwin, and after Darwin.
I have dealt thus at considerable length upon the processes whereby the originally unicellular ovum and spermatozoon become converted into the multicellular germ, because I do not know of any other exposition of the argument from Embryology where this, the first stage of the argument, has been adequately treated.
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To quickly assess the difficulty of the text, read a short excerpt:
All this, it will be noticed, is a case of cell-multiplication, which differs from that which takes place in the unicellular organisms only in its being in- variably preceded (as far as we know) by karyokinesis, and in the resulting cells being all con- fined within a common envelope, and so in not being free to separate. Nevertheless, from what has already been said, it will also be noticed that this feature makes all the difference between a Metazoon and a Protozoon ; so that already the ovum... presents the distinguishing character of a Metazoon.
FIG. 40. The contents of an ovum in an advanced stage of segmentation, drawn in perspective. (After Hackel. ) 136 Darwin, and after Darwin.
I have dealt thus at considerable length upon the processes whereby the originally unicellular ovum and spermatozoon become converted into the multicellular germ, because I do not know of any other exposition of the argument from Embryology where this, the first stage of the argument, has been adequately treated.
What to read after Darwin And After Darwin An Exposition of the Darwinian Theory And a Discussion?
You can find similar books in the "Read Also" column, or choose other free books by Romanes George John to read onlineMoreLess
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