. The study of animal life. Zoology. CHAP. VII The Industries of Animals 123 paper houses which wasps construct, are well known; but we should not forget the architecture of the mason-bees, the great towers of the termites, and the lodges of the beavers. Perhaps I may be allowed to notice once again, what I have suggested in another chapter, that while many of the shelters which animals make are for the young rather than for the adults, the hne of definition is not strict, and some which were nests to begin with have expanded into homes —an instance of a kind of evolution which is recognisable
. The study of animal life. Zoology. CHAP. VII The Industries of Animals 123 paper houses which wasps construct, are well known; but we should not forget the architecture of the mason-bees, the great towers of the termites, and the lodges of the beavers. Perhaps I may be allowed to notice once again, what I have suggested in another chapter, that while many of the shelters which animals make are for the young rather than for the adults, the hne of definition is not strict, and some which were nests to begin with have expanded into homes —an instance of a kind of evolution which is recognisable in many other cases. 5. Movements.—But animals are active in other ways. AH their ways of moving should be considered—the marvel-. FiG. 28.—Flight of crested heron, ten images per second. (From Chambers's Encyclop.\ after Marey.) lous flight of birds and insects, the power of swimming and diving, the strange motion of serpents, the leap, the heavy tread, the swift gallop of jNIammals. All their gambolings and playful frolics, their travels in search of food, and their migrations over land and sea, should be reckoned up. Most marvellous is the winged flight of birds. As a boat is borne along when the wind fills the sails, or when the oars strike the water, and as a swimmer beats the water with his hands, so the bird beating the air backwards with its wings is borne onward in swift flight. But the air is not so resistent as the water, and no bird can float in the air as a boat floats in the water. Thus the stroke has. 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 Thomson, J. Arthur (John Arthur), 1861-1933. New York, C. Scribner's sons [printed at the Edinburgh press]
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1892
