. Nature-study; a manual for teachers and students. Nature study. 15° NATURE-STUDY the skin is used partly as an organ of respiration. As a rule, these animals do not have claws on their toes. But it is tlieir develojjment from the egg that especially differentiates amphibians from the reptiles. The eggs arc generally laid in the water, or in some moist place, where. ;if â .â y .'*S .⢠â â¢v;; '^"^M' ^ ^^ Fig. 31. Strings of Toad's Eggs. they hatch from natural lieat, not into frog-like or salamander- like forms, but into tadpoles. Tadpoles at first have no visible gills, but very soon
. Nature-study; a manual for teachers and students. Nature study. 15° NATURE-STUDY the skin is used partly as an organ of respiration. As a rule, these animals do not have claws on their toes. But it is tlieir develojjment from the egg that especially differentiates amphibians from the reptiles. The eggs arc generally laid in the water, or in some moist place, where. ;if â .â y .'*S .⢠â â¢v;; '^"^M' ^ ^^ Fig. 31. Strings of Toad's Eggs. they hatch from natural lieat, not into frog-like or salamander- like forms, but into tadpoles. Tadpoles at first have no visible gills, but very soon there develop on each side of the head or neck branching gills. Later these disappear, inside gills develop, and gill slits are left in the neck as in fishes. In fact, the tadpole stage corresponds very closely in its structure and physiology to the fish. During this time the tadpole fives an aquatic fife. 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 Holtz, Frederick Leopold, 1870-. New York, C. Scribner's Sons
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