The Monthly Microscopical Journal: Transactions of the Royal Microscopical Society, and Record of Histological Research at Home and Abroad

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Robert Hardwicke, 1877 - Microscopy
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Page 155 - ... into each other, there is a pervading similarity in the nature of the histological changes by which they are reached, and that in the production of the endless variations of form assumed by the organs and systems of different animals in the course of their development, the process of cell-production, multiplication and differentiation remains identical. The more obvious morphological changes are of so similar a character throughout the whole, and so nearly allied in the different larger groups,...
Page 156 - ... specific phenomena, the phylogenetic development of the race. If we admit the progressive nature of the changes of development, their similarity in different groups, and their common characters in all animals, nay, even in some respects in both plants and animals, we can scarcely refuse to...
Page 155 - ... the morphological foundations of the future embryo or new being are laid. I need not now recur to the further series of complications in the formative process by which the bilaminar blastoderm is developed and becomes trilaminar or quadrilaminar, but only recall to your recollection that while these several states of the primordial condition of the incipient animal pass insensibly into each other, there is a pervading similarity in the nature of the histological changes by which they are reached,...
Page 48 - The germs are killed by being deprived of oxygen. For when the air which has been removed by the Sprengel pump is, after some time, carefully restored to the infusion, unaccompanied by germs from without, there is no revival of life. By removing the air we stifle the life which the returning air is incompetent to restore.
Page 248 - ... showed that these were not mere analogies, but indicated a real affinity. These observations, in the words of Allen Thomson, ' have produced a change little short of revolutionary in embryological and zoological views, leading as they do to the support of the hypothesis that the Ascidian is an earlier stage in the phylogenetic history of the mammal and other vertebrates.
Page 248 - ... position of the organs, in their passage from the embryonic to the adult state, as is not inconsistent with the supposition that the Vertebrates and the Ascidia may have had a common ancestral form. Kowalevsky's discovery opens up at least an entirely new path of inquiry; and we must be prepared to modify our views as to the entire separation of the Vertebrates from the other groups of animals, if we do not at once adopt the hypothesis that through the Ascidian and other forms the origin of the...
Page 155 - ... and continuity between them ; nor will his study of the phenomena of development in different animals have gone far before he is equally strongly convinced of the similarity of plan in the development of the larger groups, and, to some extent, of the whole. I consider it impossible, therefore, for any one to be a faithful student of embryology, in the present state of science, without at the same time becoming an evolutionist. There may still be many difficulties, some inconsistencies, and much...
Page 39 - Each essay must be accompanied by a sealed envelope containing the name and address of the author and bearing on the outside the motto or device which is inscribed upon the essay.
Page 156 - ... of any unprejudiced student of embryology that it is only by the employment of such an hypothesis as that of Evolution that further investigation in these several departments will be promoted, so as to bring us to a fuller comprehension of the most general law which regulates the adaptation of structure to function in the Universe.
Page 115 - The animal is about i -300th of an inch long and about half the breadth of the length. It is fusiform, and is clothed with ciliate hairs of extraordinary length. The head is mammilliform ; the posterior end of the body from subacute to obtuse according as it is narrowed or shortened by contraction. The cilia investing the body appear to consist of three sets— the shortest ones waving outwardly and downward from the head...

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