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FromThe Crayfish, by T. H. Huxley, 1879

Figure 29

fig. 29, eyes

FIG. 29.--Diagram showing the course of rays of light from three points x, y, z, through the nine visual rods (supposed to be empty tubes) A--I of a compound eye; a--i, the nerve fibres connected to the visual rods.

[Editor's note: illustration is reproduced here approximately twice the size of the woodcut in the book.]

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