Bioplasm : an introduction to the study of physiology & medicine / by Lionel S. Beale.

  • Beale Lionel S. (Lionel Smith), 1828-1906.
Date:
1872
Catalogue details

Licence: Public Domain Mark

Credit: Bioplasm : an introduction to the study of physiology & medicine / by Lionel S. Beale. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    it is required, and a further important change is necessary. The soft transparent tissue, of which it IS m gi-eat part composed, becomes infiltrated with earthy matter, consisting principally of phosphate of Imie and magnesia, and this process continues in progress even until after the animal has attained its perfect form. But the hone, which is first produced, is only a temporary structure, and far too weak and brittle for the requirements ; for, besides hardness, bone must possess elasticity in some degree, so that it may stand a sudden blow without breakino-. The whole of the bone first formed is, in fact, removed, and gradually replaced by a firmer, harder, much stronger, and more elastic and more permanent tissue yeiy different in structure from that which preceded it But this more perfect type of bone tissue could not have been developed at the first Its production involved a number of preliminary changes useless to the economy until the whole series was fully completed. Nor from the structural cha- racters of the early tissue would it have been possible to premie the structure assumed by the permanent bone. Here, as in so many other cases, we see highly daborate and complex structure anticipated, as it were, at a time when its actual production would theL'n'P°T^^ }\'' '^^^-^^-^ ^^-^ mtSrnf « r°^\^^^''^S'^ properties of the matter of a hvmg bemg would not enable us to form Ttake^of 'ffi-l*i--tely to take, or the office they were to discharg-e veWrr'' Tte nervous tilsue is de- bodf I^J'Kuhft^^ other textures of the remarkotr ^'''^^ undergoes the most som^of t]..^™^T'-^^' The relation of '?Sem ^-^'^ important parts of the nervous Nerve tissfe^omes T ^''^ P^^'^^^^ i^^uo comes mto very close relationship with