Evolution Old And New Or the Theories of Buffon Dr Erasmus Darwin And Lamar
Evolution Old And New Or the Theories of Buffon Dr Erasmus Darwin And Lamar
Butler Samuel
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Vii. P. 15, 1758. 134 EVOLUTION, OLD AND NEW. manner, difficult though it seems ; but in order that I may do so, I would ask the reader to lend me his atten- tion for a few moments while we regard the brain simply as brain, and have no other idea concerning it than we can derive from inspection and reflection. The brain, as well as the medulla oblongata and the spinal marrow, which are but prolongations of the brain itself, is only a kind of hardly organized mucilage ; we find in it nothing but... the extremities of small arteries, which run into it in very great numbers, but which convey a white and nourishing lymph instead of blood. When the parts of the brain are disunited by macera- tion, these same small arteries, or lymphatic vessels, appear as very delicate threads throughout their whole length. The nerves, on the contrary, do not penetrate the substance of the brain ; they abut upon its surface only ; before reaching it they lose their elasticity and solidity, and the extremities of the nerves which are nearest to the brain are soft, and nearly mucilaginous.
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