. Nature-study; a manual for teachers and students. Nature study. FROGS, TOADS, SALAMANDERS, SNAKES, ETC. 151 and breathes the air in the water with its gills. At this time the food is mainly vegetable, consisting of minute algal vegetation. Gradually, as the tadpole grows, lungs develop. Also about this time limbs develop. Finally the tail disappears, not by dropping off, but by gradual absorption and transfer of. Fig. 32. Development of a Tadpole. its substance to other parts. This loss of the tail applies only to frogs and toads. Salamanders, mud-puppies, etc., retain them. After the limbs
. Nature-study; a manual for teachers and students. Nature study. FROGS, TOADS, SALAMANDERS, SNAKES, ETC. 151 and breathes the air in the water with its gills. At this time the food is mainly vegetable, consisting of minute algal vegetation. Gradually, as the tadpole grows, lungs develop. Also about this time limbs develop. Finally the tail disappears, not by dropping off, but by gradual absorption and transfer of. Fig. 32. Development of a Tadpole. its substance to other parts. This loss of the tail applies only to frogs and toads. Salamanders, mud-puppies, etc., retain them. After the limbs and lungs have developed, most amphibians leave the water and breathe the air, their gills usually first disappearing. Thus frogs, toads, and salamanders become more or less terrestrial. This does not mean that they shun the water thereafter. In fact, frogs continue to hve what we generally call an amphibious life. They like moist places, wet meadows, damp woods, and many species spend a good share of their lives sitting half-submerged in the water of swamps and lakes. Salamanders are found in damp cellare or in damp. 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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