General principles of zoology . GENERAL ORGANOLOGY. 149 periences gained through our sensory organs. We thusknow the external world only in so far as it is accessible tothe senses, directed and carefully controlled by the powerof judgment. If things exist outside of ourselves whichhave no influence upon our senses, we can form no con-ception of them. It follows from this proposition that wecan gain knowledge of the natural capacity of the sensoryorgans of animals only by analogy with our own experi-ences. We must extend to the whole animal kingdom. Hff w FIG. 73.—Cross-section of the human spi
General principles of zoology . GENERAL ORGANOLOGY. 149 periences gained through our sensory organs. We thusknow the external world only in so far as it is accessible tothe senses, directed and carefully controlled by the powerof judgment. If things exist outside of ourselves whichhave no influence upon our senses, we can form no con-ception of them. It follows from this proposition that wecan gain knowledge of the natural capacity of the sensoryorgans of animals only by analogy with our own experi-ences. We must extend to the whole animal kingdom. Hff w FIG. 73.—Cross-section of the human spinal cord. (From Wiedersheim.) Black representsthe gray, white the white substance of the cord ; Cc, central canal, surrounded by theanterior and posterior commissures i C and C) \ Sa, Sp, anterior and posterior sulcus;VW, HIV, anterior and posterior nerve-roots; VH, HH, anterior and posterior horn ofgray matter ; y, S, //, anterior, lateral, and posterior columns of white matter. the distinction of five senses, viz., touch (including the senseof pressure, and of temperature), smell, taste, hearing, andsighl», which has become intrenched in human priori, however, it cannot be denied that sensations occurin animals which we do not experience; in following outthis course of thought, we are led to the establishment of asixth sense. A conception of this kind, however, must re-main to us a meaningless abstraction, since it is impossiblefor us to conceive of the character of a sense which we gives Insufficient Knowledg
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1896
