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Show BOOK NOTICE. Animal Mechanism: A treatise on Terrestrial and AerUl Locomotion, by E. J. Marey, prolessor ofthe college of Prance, and member of the Academy of Medicine ; with 117 illustrations. New York: D. Appleton & Co. For sale in bait Lake city by James Dwyer. This is volume eleven of the international inter-national scientific scries, and is a philosophical popular treatise on locomotion. lo-comotion. Commencing with the forces in the inorganic kingdom and among organized beings, it discusses the quality and action of matter, the indestructibility of force and its transformations, trans-formations, the vital forces and the laws in physics and in physiology. The origin of animal heat and the various theories in reference to it are reviewed. Animal motion, the contraction con-traction and work of the muscles, electricity in animals, animal mechanism, mech-anism, harmony between the organ" and the function, and the development develop-ment hypothesis are treated at length. The author's discussion of the development theory of Darwin is very candid and sensible, and he arrives at the statement that in the absence of experimental conclusion the hypothesis can neither bo proved nor refuted. Bathe insists that we have a right to demaud of the advocates ad-vocates of development, even now, that they should show us tho tendency ten-dency under tho lorm of a slight variation vari-ation in the anatomical characters of individuals when exposed to certain influences whi'.'h continued from generation gen-eration to generation, would in the end produce the most important modifications in the specie. Tue chapters in regard to locomotion locomo-tion aro pccu-iarly interesting. In refereuce to aerial locomotion, the author confidently predi.ts thai success suc-cess will be attained in the reproduction reproduc-tion ofthe mechanism of night. The plan of the experiments consist in i continually comparing the artificial j instruments of flight with the real i ijird, and the illustrations of this work go to prove that mechanism! can always reproduce a movement, ! tho nature of which has been clearly I defined. I |