Back to Nature - Handbuch für Malawi Buntbarsche 2. Auflage by Ad Konings

By Ad Konings

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Extra info for Back to Nature - Handbuch für Malawi Buntbarsche 2. Auflage

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SEA-ANEMONE ACTING AS BOAT. "WATER-SNAIL ACTING A3 BOAT- BIRCH-BARK CANOE. PUPA SKIN OF GNAT ACTING AS BOAT. that the shell is downward, spreads out the foot as widely as possible, and then contracts it in the centre, so as to form it into a shallow boat. The carrying capacity of this boat is necessarily small, but as the shell and nearly the whole of the animal are submerged, and therefore mostly sustained by the water, a very small amount of flotative power is sufficient for the purpose. Some- 8 NATURE'S TEACHINGS.

The improvement to which I refer is that which is now almost universally employed in the construction of iron ships, namely, the making the outer shell double instead of single, and dividing it into a number of separate compartments. Putting aside the advantage that if the vessel were stove, only one compartment would fill, we have the fact that the ship is at the same time TRANSVERSE SECTION OF IKON SHIP. STELLATE TISSUES. LONGITUDINAL SECTION OF IRON SHIP. enormously strengthened and very light in proportion to her bulk.

ANOTHER great improvement in ship-building now comes before us. We have already seen that the earliest boats were merely hollowed logs, just as Eobinson Crusoe is represented to have made But these had many disadvantages. They were always too heavy. They were liable to split, on account of flaws in the wood, and if a large vessel were needed, it was difficult to find a tree sufficiently large, or to get it down to the water when finished. So the next idea was to build a skeleton, so to speak, of light wooden beams, and to surround it with an outer clothing or SKELETON OF FISH AND BOAT.

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