Beginners' zoology . Which has comparatively largereyes, an insect or a beast .-*Inherited Habit, or Instinct. — Insects and other ani-mals inherit frohi their parents their particular form ofbody and of organs which perform the different example, they inherit a nervous system with a struc-ture similar to that of their parents, and hence with a ten-dency to repeat similar impulses and acts. Repeated actsconstitute a habit, and aji inherited habit is called an in-. FiG. 135.—Compound EyeOF Insect, I, hexagonal facets of crystallinecones. 6, blood vessel in optic nerve. 8o BEGINNER
Beginners' zoology . Which has comparatively largereyes, an insect or a beast .-*Inherited Habit, or Instinct. — Insects and other ani-mals inherit frohi their parents their particular form ofbody and of organs which perform the different example, they inherit a nervous system with a struc-ture similar to that of their parents, and hence with a ten-dency to repeat similar impulses and acts. Repeated actsconstitute a habit, and aji inherited habit is called an in-. FiG. 135.—Compound EyeOF Insect, I, hexagonal facets of crystallinecones. 6, blood vessel in optic nerve. 8o BEGINNERS ZOOLOGY stinct. Moths, for example, are used to finding nectar intiie night-blooming flowers, most of which are white. Thehabit of going to white flowers is transmitted in the struc-ture o£ the nervous system; so we say that moths havean instinct to go to white objects; it is sometimes moreobscurely expressed by saying they are attracted or drawnthereby. Instincts are not Infallible. — They are trustworthy inonly one narrow set of conditions. Now that man makesmany fires and lights at night, the instinct just mentionedoften causes the death of the moth. The instinct topro^ide for offspring is necessary to the perpetuation ofall but the simplest animals. The dirt dauber, or mudwasp, because of inherited habit, or instinct, makes thecell of the right size, lays the &%%, and provides food foroffspring that the mother will never see. It seals stungand semiparalyz
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Keywords: ., bookcentury1900, bookdecade1920, booksubjectzoology, bookyear1921
