. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. A. Helix pomatia, after Babuchin. ps., Pigment cell, thought to'be sensory; a., " ; pz. Fig. B. Helix pomatia, after Hilger. stm., Rod-mantle; ps., pigment cell; stz., rod-cell; both kinds of cells considered sensory. firm his observations. Nevertheless, as there is, according to Hesse, a delicate, brush-like rod on the sensory cells of the retina of Haliotis, Patten probably saw some indication of it in his preparations. Patten's studies of neurofibrils preceded those of Apathy by more than a de
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology. Fig. A. Helix pomatia, after Babuchin. ps., Pigment cell, thought to'be sensory; a., " ; pz. Fig. B. Helix pomatia, after Hilger. stm., Rod-mantle; ps., pigment cell; stz., rod-cell; both kinds of cells considered sensory. firm his observations. Nevertheless, as there is, according to Hesse, a delicate, brush-like rod on the sensory cells of the retina of Haliotis, Patten probably saw some indication of it in his preparations. Patten's studies of neurofibrils preceded those of Apathy by more than a decade, and he was therefore, consciously, the pioneer in a new field, namely, the study of the finer elements in the peripheral endings of the nervous sys- tem. He recognized the significance of the discoveries of Babuchin and Hensen as they themselves did not. He pointed out the futility of con- sidering the presence or absence of pigment a criterion for judging of the sensory character of the retinal cells. Parker ('95) gave the death-blow to Grenacher's theory, that the recipient elements in the eyes of arthropods are cuticular, when he showed that the rhabdomes of the eyes of the crayfish are made up of neurofibrils from the retirmlar cells. Thus, the erroneous notion that. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Harvard University. Museum of Comparative Zoology. Cambridge, Mass. : The Museum
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