Evolution of To-Day; a Summary of the Theory of Evolution As Held By Scientists At the Present Time, And An Account of the Progress Made By the Discussions And Investigations of a Quarter of a Century
Evolution of To-Day; a Summary of the Theory of Evolution As Held By Scientists At the Present Time, And An Account of the Progress Made By the Discussions And Investigations of a Quarter of a Century
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In our eReader you can find the full English version of the book. Read Evolution of To-Day; a Summary of the Theory of Evolution As Held By Scientists At the Present Time, And An Account of the Progress Made By the Discussions And Investigations of a Quarter of a Century Online - link to read the book on full screen. Our eReader also allows you to upload and read Pdf, Txt, ePub and fb2 books. In the Mini eReder on the page below you can quickly view all pages of the book - Read Book Evolution of To-Day; a Summary of the Theory of Evolution As Held By Scientists At the Present Time, And An Account of the Progress Made By the Discussions And Investigations of a Quarter of a Century
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Now the higher members of the mollusks (cephalopods) possess eyes which bear the greatest similarity to those of verte- brates, each having sclerotic, retina, choroid, vitreous humor, aqueous humor, and lens. The correspond- ence at first sight seems complete, and remember- ing the remarkable complexity of the organ, together with the fact that the various parts are only of use when the others are present, it becomes a marvellous thing to find such an organ independently developed in two differ...ent cases. This difficulty Darwin has answered as follows : " Beyond a superficial resem- blance, there is hardly any real similarity between the eyes of cuttle-fishes and vertebrates. * * * The crystalline lens in higher cuttle-fishes consists of two parts placed one behind the other like two lenses, both having a very different structure and disposi- tion to what occurs in the vertebrates. The retina Digitized by VjOOQIC SIMILARITY IN ACQUIRED ORGANS, 233 IS wholly different, with an actual inversion of the elemental parts, and with a large nervous ganglion included within the membranes of the eye.
What to read after Evolution of To-Day; a Summary of the Theory of Evolution As Held By Scientists At the Present Time, And An Account of the Progress Made By the Discussions And Investigations of a Quarter of a Century?
You can find similar books in the "Read Also" column, or choose other free books by Conn, H. W. (Herbert William), B. 1859 to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
Now the higher members of the mollusks (cephalopods) possess eyes which bear the greatest similarity to those of verte- brates, each having sclerotic, retina, choroid, vitreous humor, aqueous humor, and lens. The correspond- ence at first sight seems complete, and remember- ing the remarkable complexity of the organ, together with the fact that the various parts are only of use when the others are present, it becomes a marvellous thing to find such an organ independently developed in two differ...ent cases. This difficulty Darwin has answered as follows : " Beyond a superficial resem- blance, there is hardly any real similarity between the eyes of cuttle-fishes and vertebrates. * * * The crystalline lens in higher cuttle-fishes consists of two parts placed one behind the other like two lenses, both having a very different structure and disposi- tion to what occurs in the vertebrates. The retina Digitized by VjOOQIC SIMILARITY IN ACQUIRED ORGANS, 233 IS wholly different, with an actual inversion of the elemental parts, and with a large nervous ganglion included within the membranes of the eye.
What to read after Evolution of To-Day; a Summary of the Theory of Evolution As Held By Scientists At the Present Time, And An Account of the Progress Made By the Discussions And Investigations of a Quarter of a Century?
You can find similar books in the "Read Also" column, or choose other free books by Conn, H. W. (Herbert William), B. 1859 to read onlineMoreLess
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