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

Cover 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

Conn, H. W. (Herbert William), B. 1859

The 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 was written by author Conn, H. W. (Herbert William), B. 1859 Here you can read free online of 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 book, rate and share your impressions in comments. If you don't know what to write, just answer the question: Why is 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 a good or bad book?

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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.

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