Larma Nucent Sectory 21

Somewhat higher than the fish in the scale of life is the frog. Although he begins life as a fish, and in the tadpole state breathes by gills, he soon discards the water-diluted air of the pond, and with perfect lungs boldly inhales the pure air of the upper world. His life as a tadpole, although so fish-like, is much inferior to true fish life: for though the fish has not the perfect lung, he has a modification of it which he fills with air, not for breathing purposes, but as an air-sac to make him float like a bubble in the water. Will he rise to the surface? he inflates the air-bladder. Will he sink to the bottom? he compresses the air-bladder. But in the frog the air-bladder changes into the lungs, and is never the delicate balloon which floats the fish in aqueous space. When the frog's lungs are perfected, his gills close, and he forever abandons fish-life, though being a cold-blooded creature he needs comparatively little air, and delights to return to his childhood's home in the bottom of the pond. But although he can stay under water for a long time, he is obliged to hold his breath while there, and when he would breathe must come to the surface to do so. It is possible to drown him by holding him under water.

This wild Rabbit has been startled by some noise, and the next moment she may be scampering away to her burrow, with the little bunnies, at the top of their speed, and crouch there until all is quiet again. Rabbits usually select, if possible, a sandy soil overgrown with furze, in which to make their burrows, as such a soil is easily removed, and the dense prickly furze hides their retreat, whilst it affords them a wholesome and never-failing food. These furze bushes are constantly eaten down, as far as the rabbits can reach standing on their hind legs, and consequently present the appearance of a solid mass with the surface even and rounded. These animals retire into their burrows by day to rest, and come out only in the twilight to obtain food.

• Video Professor - The Video Professor
• Video Professor - The Video Professor
• Video Professor - The Video Professor
• Video Professor - The Video Professor
• Video Professor - The Video Professor

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