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Growth Continues: As growth continues, the hind legs appear. They are very small when they first break through the skin but shortly take on the form of legs. Soon they, along with the tail, aid the tadpole in swimming.
Next the forelegs appear. They have been developing inside the gill chamber. Usually the left leg comes through the spiracle first. The right leg comes through the operculum.
Studies conducted in 1954 by Theodore T. Kozlowski and R.C. Ward at Westfield, Mass., confirmed that in a number of species elongation commences in late spring and continues for several weeks. Rates of elongation are low at the outset, increase rapidly, and then diminish about midsummer. In more northern latitudes, elongation commences later in the year and the growing period is shorter. Patterns of seasonal height growth manifest pronounced similarities, although some species grow much faster than others, and are characterized by a longer period of growth each year.
Lateral growth in trees frequently begins later than growth in height, but the period of lateral growth is longer. Rates of lateral growth likewise are low at the outset, increasing after a few weeks and then diminishing. In view of the long annual period of lateral growth in trees, deleterious environmental conditions may exercise a pronounced effect on growth. In the wood of trees of temperate regions, narrow and wide growth rings may be observed, marking years characterized by unfavorable and favorable conditions for growth.
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