. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. ELEMENTS OF ZOOLOGY CHAPTER I THE CRICKET: A STUDY OF THE ANATOMY AND PHYSIOLOGY OF INSECTS. The cricket is a thing that can move of itself, can feed and grow and produce young hke itself; consequently it is hving. It has numerous external parts and complex internal organs ; hence it is an or- ganism. It moves freely from place to place, and devours and digests sohd food; and so it is an animal (Fig. 1). An animal is a complex machine built up of a remarkable substance called protoplasm and of materials tha
. Elements of zoology, to accompany the field and laboratory study of animals. Zoology. ELEMENTS OF ZOOLOGY CHAPTER I THE CRICKET: A STUDY OF THE ANATOMY AND PHYSIOLOGY OF INSECTS. The cricket is a thing that can move of itself, can feed and grow and produce young hke itself; consequently it is hving. It has numerous external parts and complex internal organs ; hence it is an or- ganism. It moves freely from place to place, and devours and digests sohd food; and so it is an animal (Fig. 1). An animal is a complex machine built up of a remarkable substance called protoplasm and of materials that it produces. Proto- plasm looks like a jelly, but it is really itself highly organized, so that the animal ma- chine differs from man-made machines in having a mechanism inside the very substance of which its parts are made. Some idea of protoplasm may be got from Figure 2, which shows a bit of it existing as a free Uving animal with no other organs than those essential to all proto- plasm. But in higher animals the body gains a great size; contains huge spaces that are filled with water or air; and is built up of membranes that cover the surface of the body (the skin) or hne the food-canal and body-cavities, of masses that support the other parts (the skeleton) or are used for Fig. 1. —Cricket, immature. Nat. size. Photo, by W. H. C. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Davenport, Charles Benedict, 1866-1944; Davenport, Gertrude Anna Crotty, 1866- joint author. New York, Macmillan
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1911
