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As the main valley deepens, the tributary stream-beds are deepened also, and gradually cut their way headwards, enlarging the area whence they draw their supplies.

Sometimes he goes feetwards and sometimes he goes headwards and sometimes he turns a somersault in the air before he touches the water.

Now he puts out his hands, like this, and he calls out, “This time I’m going to take a headwards dive!”

Along the banks of the trunk streams short gullies are slowly lengthening headwards, like growing twigs which are sometime to become large branches.