. Anatomischer Anzeiger. Anatomy, Comparative. 176 as I count them but that is not in any way essential to the present Fig. 5. Head of an older embryo, showing the anterior accessory vesicle, , occupping the region of the thalamencephalon. op lateral Eye. A. op1 accessory optic vesicle, mb mid-brain, cb cerebellum, au auditory vesicle. ne, n7, etc. neuromeres of hind-brain. He mandibular cavity. The facts recorded above are of such a novel nature that it will not be out of place to mention here the precautions I have taken in observing them. The fact that the Zieglek's have r
. Anatomischer Anzeiger. Anatomy, Comparative. 176 as I count them but that is not in any way essential to the present Fig. 5. Head of an older embryo, showing the anterior accessory vesicle, , occupping the region of the thalamencephalon. op lateral Eye. A. op1 accessory optic vesicle, mb mid-brain, cb cerebellum, au auditory vesicle. ne, n7, etc. neuromeres of hind-brain. He mandibular cavity. The facts recorded above are of such a novel nature that it will not be out of place to mention here the precautions I have taken in observing them. The fact that the Zieglek's have recently studied and modeled Torpedo embryos in the same stages of development and have given no record even of the eye vesicles, is against my position, and, of course, there is any amount of negative evidence opposed to it. I have had the use of a large number of embryos of Squalus acanthias (and also a few specimens of Galeus canis) covering thoroughly the stages from Balfour's stage "B" to his stage "G". All the stages have been most carefully studied from the exterior and then sectioned. For surface study, I have made it a uniform practice to photograph every specimen studied. I have in addition made a camera sketch of every specimen. The specimens have been rotated and studied from every possible point of view. To avoid being de- ceived by the play of light and shade, I have passed, under the microscope, a beaded bristle into all cavities and over all the surfaces watching carefully its course, and, finally, I have verified the external observations by study of sections. I value most of all, as external views, the series of photographs I have made, since the structures as. 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 Anatomische Gesellschaft. Jena : G. Fischer
Size: 2169px × 1152px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookpublisherjenagfischer, books
