Carpenter, William Benjamin, 1813-1885, Dallinger, W. H. (William Henry), 1842-1909 · Philadelphia, Blakiston · leaf 964
d a rhabdom (see fig.675) formed by the nerve-rod. After traversing the pyramidsthe rays reach the extremities of.the fibres of the optic nerve, whichare surrounded, like the pyramid,by pigmentary substance. Thus therays which have passed through theseveral corneules are prevented Fig. 674.—Diagram… … from mixing no rays, save with each other ; andthose which pass m the axes of the pyramids, can reachthe fibres of the optic nerve. Hence,it is evident that, as no two ocellion the same side (fig. 673) haveexactly the same axis, no two canreceive their rays from the same point of an object ; and…
Microscopy
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