. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 66 MARINE BIOLOGICAL LABORATORY. two halves, which are at first completely separate, by concrescence. And each band grows at its posterior )atii- i&. V ^ 1 / \t : / 1 ^ 1 h A \ /^ \—A 1° / \. Fig. 3. tip, the somites being progressively developed from this point forwards, , by apical growth. I think it must be clear, therefore, that the investiga- tion, from an embryological point of view, of metamer- ism, of apical growth, and of concrescence is insepara- ble from the study of the
. Biological lectures delivered at the Marine Biological Laboratory of Wood's Holl [sic]. Biology. 66 MARINE BIOLOGICAL LABORATORY. two halves, which are at first completely separate, by concrescence. And each band grows at its posterior )atii- i&. V ^ 1 / \t : / 1 ^ 1 h A \ /^ \—A 1° / \. Fig. 3. tip, the somites being progressively developed from this point forwards, , by apical growth. I think it must be clear, therefore, that the investiga- tion, from an embryological point of view, of metamer- ism, of apical growth, and of concrescence is insepara- ble from the study of the whole series of phenomena relating to the mesoblast formation ; and that a close study of the origin of the mesoblast in annelids is of great importance to comparative embryology. If we turn now to the literature of the subject, we find the utmost confusion, the most extraordinary differences of opinion among the various authors, respecting almost every detail of the subject. We find the mesoblast de- scribed by one author as arising wholly from the ecto- blast, by another as arising from the entoblast, by others as arising from both layers, or again as arising. 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 Marine Biological Laboratory (Woods Hole, Mass. ). Boston, Ginn & Co
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectbiology, bookyear1890
