Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . old next describes the granules of the germ-mass as being decomposed into almost imperceptible molecules, inwhich we may recognise the ordinary result of the fissiparous pro-perty of its constituent nucleated cells : their powers of assimilationare at the same time manifested by the changes which they effect inthe albumen, at the expense of which they seem, in the first instance,to increase their numbers, and diffuse themselves over the surfaceof the vitellus. This cove
Lectures on the comparative anatomy and physiology of the invertebrate animals : delivered at the Royal College of Surgeons . old next describes the granules of the germ-mass as being decomposed into almost imperceptible molecules, inwhich we may recognise the ordinary result of the fissiparous pro-perty of its constituent nucleated cells : their powers of assimilationare at the same time manifested by the changes which they effect inthe albumen, at the expense of which they seem, in the first instance,to increase their numbers, and diffuse themselves over the surfaceof the vitellus. This covering of the yolk Herold calls coliqua-mentum. He observes, that the original position of the germ-spotis indicated by a clear, transparent point (hyaline ?) ; that this pointbecomes thickened, pearly, and opaque, so as to conceal the subjacentvitelline cells. He calls this the nucleus of the germ or the cambium{fig. 174, «). A similar change progressively extends over the col-liquamentum ; and, when one-fourth of the circumference of the yolkis thus covered, the opaque layer has taken on a definite form,174 175 176 a h.
Size: 1461px × 1711px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1850
