The nest is oval in form, and is well-carpeted with dry weeds and grass. Here the young reside on soft beds until they are large enough to care for themselves. There are from one to four in each nest.
There are no greater architects in the universe than may be found among the coral-polypes. These interesting little animals of the deep have been much misunderstood, and have sometimes had the erroneous designation of "insect" bestowed upon them. The word "insect" has been applied in a very loose and general sense in other days; but naturalists and scientists should see to it that the use of this term be corrected in reference to these wonderful coral-architects, and that no informed person refer to them except as animals. Even poets have been guilty of propagating the most erroneous ideas about the nature and works of these sea-builders. Montgomery, in his Pelican Island, makes statements that are shocking to an intelligent thinker, and which no scientist can excuse on the ground of poetical license. "The poetry of this excellent author," says Dana, "is good, but the facts nearly all errors—if literature allows of such an incongruity." Think of coral-animals as being referred to as shapeless worms that "writhe and shrink their tortuous bodies to grotesque dimensions"! These deep-sea builders manufacture or secrete from their own bodies the coral substance out of which the great reefs are built. It is a part of their life work and nature, as a flower produces its own colours and shapes; it is amusing to know that it has only been about one hundred and fifty years since it was discovered not to be a plant but an animal! Even Ovid states the popular belief of the classic period when he speaks of the coral as a seaweed "which existed in a soft state as long as it remained in the sea, but had the curious property of becoming hard on exposure to the air."
These strange coral-producing animals of the deep demand two especially important conditions only under which they will thrive: namely, a certain depth of water and a certain temperature. Thus it is seen that the warmth of the sea determines the distribution of the corals; the geography of these animals is defined by degrees of temperature. Only in equatorial seas may reef-building corals be found; and if we select the "Equator as a natural centre of the globe, and measure off a band of 1800 miles in breadth on each side of that line," we will find that it will include the chief coral regions of the earth.
The work of the corals is most interesting. Small as are these tiny workmen, each and every one does his bit and, speck by speck, adds his minute contribution to the growing mass of coral until entire islands are surrounded by extensive reefs. Tahiti, for example, is surrounded by a barrier reef which is really an immense wall. The large barrier reef on the northeast coast of Australia extends in a continuous line for 1,000 miles, and varies from 10 to 90 miles in breadth. Some reefs are mere fringes which simply skirt the coast lands, and seem to be mere extensions of the beach. Still another variety of reef is known as the "atoll" or "lagoon" reef. This latter form is seen in circular rings of coral of various breadths which enclose a body of still water—the lagoon. There are many of these coral islands in the Indian and Pacific Oceans. Keeling or Cocos Atoll, of the Indian Ocean, is 9½ miles in its greatest width; Bow Island is 30 miles in length, and 6 miles wide; while in the Maldive Archipelago one island measures 88 geographical miles in length, and in some places is 20 miles wide. When one beholds a large coral ring, covered with rich soil and tropical vegetation, and "protecting a quiet lake-haven from the restless ocean without, it is little to be wondered at that the earlier voyagers recorded their surprise that the apparently insignificant architects of such an erection are able to withstand the force of the waves and to preserve their works among the continual attacks of the sea." As Pyrard de Laval truly said, "It is a marvel to see each of these atollons surrounded on all sides by a great bank of stone—walls such as no human hands could build on the space of earth allotted to them.... Being in the middle of an atollon, you see all around you this great stone bank, which surrounds and protects the island from the waves; but it is a formidable attempt, even for the boldest, to approach the bank and watch the waves roll in, and break with fury upon the shore."
As to the explanation of the modes of formation of these coral-reefs, the scientists have long been propounding theories which are sometimes amusing. Strangely enough they have nearly all explained that coral-polypes aggregate themselves in the forms of atolls and barrier-reefs by a mysterious "instinct," mediocrity's only term for screening its ignorance, and which is also given as the cause for their secreting lime. Flinders says that they form a great protecting reef in order that they may be protected by its shelter, and that the leeward aspect of the reef forms a nursery for their infant colonies.
Thus we see that these same scientists are accrediting these little architects with the possession of a great intelligence, and they are thought to co-operate together in a manner expressive of the greatest degree of efficiency and brotherly feeling. Each of these scientists gives a theory that leaves untouched the essential question of the causes for coral-reefs assuming their various shapes; and it is reasonable to believe that they work according to a divine wisdom and plan, and that mankind does not yet understand their strange ways, which give us a higher conception of the universe than that held by the ancients. Science has come to the point where it must recognise the perfect unity of all life, and that our fellow-architects, engineers, and house-builders in the animal world also fill an important place in Nature's great scheme.
XI
FOOD CONSERVERS
"He prayeth well who loveth well
Both man and bird and beast.
He prayeth best who loveth best
All things both great and small;
For the dear God who loveth us,
He made and loveth all."
—Coleridge.