Knowledge of natural history, revfrom Reason why: natural history, giving reasons for hundreds of interesting facts in connection with zoology; and throwing light upon the peculiar habits and instincts of the various orders of the animal kingdom . the brokenwater in the midst of a torrent, and there the fish shows himself, risingfrom a part of the river where men could not preserve their footing, thoughassisted by poles, or locking their arms together. 1141. Why do the jack and stickleback fceep up acontinual motion of the fins nearest their gills? Because they frequent still shallows, and req
Knowledge of natural history, revfrom Reason why: natural history, giving reasons for hundreds of interesting facts in connection with zoology; and throwing light upon the peculiar habits and instincts of the various orders of the animal kingdom . the brokenwater in the midst of a torrent, and there the fish shows himself, risingfrom a part of the river where men could not preserve their footing, thoughassisted by poles, or locking their arms together. 1141. Why do the jack and stickleback fceep up acontinual motion of the fins nearest their gills? Because they frequent still shallows, and require thewater to be perpetually brought to their gills. In thiscase, the water does not come of itself, and, therefore, thefish moves his pectoral fins continually to create a perpetualchange in the water, propelling that which has alreadypassed through the gills, bringing fresh in its place, andthus keeping up a constant current. 1142. Neither to the jack nor the stickleback does the motion appearto cause any exertion; it seems natural to them, and a distinct functionapart from the motion of the fins for swimming purposes. It is, in fact,somewhat analogous to the perpetual motion of the heart, lungs, andinternal viscera in the human 350 KNOWLEDGE OF NATURAL HISTORY. A man may fish with the worm that hath eat of a king, and eat ofthe fish that hath fed of that worm.—Shakspere. 1 143. Why do fishes which swim vertically inhabitnear the surface, while those which swim horizontally fceep to the bottom? The fish which swimson edge has the tailmuch more effectivelyformed as a swimmingorgan, and the fins muchfirmer, as well as moreproduced; they are,therefore, rapid swim-mers, and rather dis-cursive in their a opposite development, fishes swimming on the flatof their bodies can only progress slowly, and do not, onthat account, range far. 1 144. Why will a fish which has broken away with ahook, frequently take another hook immediately afterwards?Because the mouths
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1916
