. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 374 bulletin: museum of comparative zoology. Lyon, Ehrlich's stain and picric acid-fuchsin, and Ehrlich's stain and Orcein; impregnation after Bielschowsky was also used. The results at which I have arrived after studying these microscopi- cal preparations are entirely different from those which Gadow pub- lished in his paper ahead}' referred to. Each appendage consists of an inner cutis papilla and an epidermal outer layer of very peculiar appearance. This outer layer is made up of many longitudinal ridges o
. Bulletin of the Museum of Comparative Zoology at Harvard College. Zoology; Zoology. 374 bulletin: museum of comparative zoology. Lyon, Ehrlich's stain and picric acid-fuchsin, and Ehrlich's stain and Orcein; impregnation after Bielschowsky was also used. The results at which I have arrived after studying these microscopi- cal preparations are entirely different from those which Gadow pub- lished in his paper ahead}' referred to. Each appendage consists of an inner cutis papilla and an epidermal outer layer of very peculiar appearance. This outer layer is made up of many longitudinal ridges of epidermis cells, between which are found deep longitudinal grooves. These grooves are filled with the cutis tissue. In transverse section (Fig. A) this condition is very conspicuous, reminding one somewhat of the transverse section of a developing feather. The stratum corneum is not thick, but quite distinct, and outside this is still another continuous external layer of horny cells, which form a kind of loose covering, thus indicating that these appendages,. 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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