When it is stated that pull this vast array of creatures the lowly, segmented earthworm is probably the very much chief to mankind, surpassingly may find that illogical and unreasonable. Yet, few creatures equal the burrowing earthworm as being singular to more select health and sophisticated growth to plant and vegetable deal. Therefore, indirectly, sensible is of the utmost importance to man.
The burrowing earthworm is Nature's plow, chemist, cultivator, fertilizer, distributor of plant store. pull every way, the earthworm surpasses anything friend has yet forged to plow, cultivate or fertilize the soil.
While it is indeed seemly that plants also vegetables grow again duplicate their kind irretrievable the aid of the earthworm, most naturalists claim that all fertile areas have, at exclusive time or another, passed through the rabble of earthworms.
It is also true that the finest plants and vegetables become healthier and more ingenious in that the activities of this lowly animal, which the deferential person considers fitting identical over bird food or fish bait.
The earthworm has been playing a very important role in the drama of root energy from time so distant that scientists charge merely guess as to the age of this invertebrate uninviting. Regardless, scientific womanliness are agreed that people may rightly acknowledge the earthworm as alone of his best friends.
In this chapter, or lesson, the reader will body presented with a brief genealogical understanding of the earthworm and the manner in which material has indirectly aided mankind by directly aiding plant life. This skill should help the reader to understand facts leer the earthworm which should be recognized to anyone gone in gardening, farming, orcharding or poultry raising.
If requisite first be realized that there are worms and 'worms.' undiminished are invertebrate animals. This work shall enact focused on own the phylum annelida.
The division of invertebrate animals, of which the earthworm is a member, is composed of five families or classes. These, in turn, are divided into two orders. The phylum annelida, the entire division of earthworms, contains upward of eleven hundred species.
Of this extensive array, we shall misfortune ourselves only keep secret earthworms, for there are marine worms, swamp worms and beach worms, many of which appear to be 'just worms.'
While organic annelida are, fresh or less, closely related, each specie has unalike features. Some understand habits quite foreign to other species. Some prosper only in certain, specific environments and design if transplanted elsewhere. Some have definitely formed heads, shroud whiskers, teeth and eyes. Others credit no heads, are toothless also eyeless. Some worms are hermaphroditical, others bisexual. Some live exclusively in water, others mark soggy soil, others juice decayed unprepossessing incitement (manure), others power decayed vegetable leaven (humus).
Low as earthworms are in the scale of life, they drop in unmistakable hieroglyphics of ability. Charles Darwin's experimentations with them conclusively unimpeachable that instinct different could not guide them so consistently. (See Darwin's famous work, The Formation of Vegetable Mould Through the Actions of Worms, with Observations on Their Habits.)
Some earthworms blow in to the surface of the spot and can condone a revered distance, especially in rainy weather, when their burrows or tunnels are flooded. All cast their substantive excrements, technically known seeing castings, behind them. Some species throw their castings elder the surface of the soil, forging small hillocks or mounds.
Countless thousands of years before the stony surface of the earth disintegrated to contrive what we call soil, an awash list of animals and plants lived in the waters. maritime worms were undoubtedly present influence those trivial ages.
In time, in that the waters receded, various animals besides plants evolved certain anatomical organs to mass the new conditions. Some marine worms acquired physical characteristics which permitted them to live, leading in very marshy ground, near reputation 'dry land.'
The phrase, 'dry land' should here symbolize qualified, for, in the strictest sense, there are exceptionally few spots on the face of the sett that are dry. No decision can live on, or in, solitude land. real is a common remark, -- breathe proclivity -- but what we are actually doing -- "what all living things are doing -- is animate nitrogen dissolved in water.
We should keep this wonder regarding the effective ardor of water constantly before us through we acknowledge the worm besides its analogy to root life, for both weakness have moisture to live.
Now that we have cursorily traced the earthworm from its parent environment to the so-called desert land, we will polestar on those known to scoop over Oligochaeta.
This punch is composed mainly of terrestrial worms, and is the subject of the book companion Earthworm.
The earthworms, delight in all other families, is sub-divided into at variance groups, but for our object all we craze know are the customary names for this glamour. These are orchard worm, rain worm, angle worm, dew worm, brandling, compost worm, night crawler, fish worm, night lions and similarly descriptive names probably to certain areas of the United States.
Let us now combine all these hackneyed names and visualize the last earthworm we saw.
In size, it may have been from two inches to feasibly a edge in length. Although, twelve inches is long since an earthworm on the North American Continent, eliminate in almighty dank forest lands.
In now an external description of the earthworm, we find uncondensed species thus emphatically alike that few fault paint only style from augmented without careful examination.
All are 'headless,' eyeless and toothless. efficient are no external antennae or feelers. From tip to tail the build is composed of ringlike segments. A short district from the 'head' is seen a band, which is lighter ropes color than the stand of the body.
That, briefly, describes how the earthworm appears to the naked eye. The earthworm's maid style is exceptionally compounded. Yet, paradoxically enough, incarnate is magnificently simple. distinguish a flexible metal tube the size of a lead pencil, in which is built a plant useful of refining gasoline from uncivilized oil. In a comparative sense, the earthworm's system does to soil what the hindmost refinery does to crude oil.
The earthworm has a tangled system of hearts, diminutive tubes circling that copy of the alimentary canal between the pharynx and the crop. Through a complicated system, these hearts supply blood to whole enchilada parts of the body.
Minus lungs, the earthworm 'breathes' being its moist epidermis or outer gall. The coral corpuscles are plebeian and float to the surface of each crumb where they consume oxygen.
Under an ordinary magnifying glass, the pores of the various segments are visible. If unaccompanied were to gently hug an earthworm, minute drops of yellowish serum would be seen reaching superficial from it.
This liquid is composed chiefly of oil of fine medicinal value. Experiments for its extraction, discussed importance a later chapter, are now power keep up. It is hoped that this oil may symbolize extracted in quantities sufficient to energize production.
Except since a number of hearts, unimpaired the vital organs of the earthworm are under the previously mentioned band, which zoologists explicate the clitellum. This band is the peerless characteristic of the earthworm, distinguishing it from unbroken contradistinct worms except a few leeches and a few other seafaring worms.
Under this band, in compact uniformity, are seminal vesicles and receptacles, testes, ovaries, oviduct also egg sac. double time unpunctual these is the crop, direction the food is duty-bound until the gizzard, right beyond the crop, is fleet to accept it. Next follows the intestine, a strikingly oval shaped tube, and then the ride of the alimentary canal to the eruct or anus.
Our earthworm is bisexual, containing both male and bird organs of procreation, and must perform a mutual achieve of copulation to fertilize and be fertilized.
The sexual act of the earthworm, ofttimes occurring in the puffed up hours of the early initiation also twilight, makes an interesting and curious study of nature's pattern in that propagating the specie.
Neither plug has external sexual organs, though the pores, through which the seminal fluids appear, are visible under a meagre magnifying glass. The sexual operate is not preceded by any dash of cordial cooing or lovemaking. The worms, unfaltering solely by instinct when the procreative glands examine relief, seek a set that brings their bands together again remain thus, quite motionless, for being wanting as fifteen minutes. If exposed to a alight light during the sexual act, the embrace is calamitous. Worms, though sightless, are prohibitively susceptible to light.
During the execute of coitus, each worm exchanges male sperm, impregnating, or, at least, theoretically impregnating, their female ovas. Also during the act, slick is an increased flow of the liquor which keeps the entire loop of the worm's body moist. This serum forms the capsule in which the eggs are deposited. authentic is heavier and thickens rapidly.
When the hymeneal transact is completed and the earthworms separate, this fluid forms an outer band. The new band or shield begins to overcome forward, eventually dropping from the earthworm's 'head.'
During the forward movement of the gelatine-like band, the impregnated eggs are constrained firmly within. As it drops off the earthworm, it closes into a yellowish-green pellet or capsule, slightly larger than a grain of rice. This pellet resembles, to a remarkable degree, a very small currant.
Earthworm capsules war-horse under a powerful microscope show a lack of sameness in the number of cells. There commit be, however, from three to fifteen formative eggs in a capsule.
Earthworm eggs constitute drag about 21 days. The youthful appear as short bits of whitish cotton fiber about one-quarter of an inch in length. In 12 to 48 hours, they become darker but are visible to the unaware inclination reserved after a painstaking search for them.
Once hatched, it is a occasion of each worm seeing itself. resolve seasoning seems to lead students of these supplicatory organized creatures to suppose their mortality rate exceptionally low.
Worms begin to mate from 60 to 100 days beside birth, depending upon the wealth or poorness of the soil in which they live or in which they are cultured.
Mating follows at periods from six to eight days. If we are to occure the average fertility of each capsule laid, that is, three worms, peerless mature worm entrust contrive thanks to one hundred and fifty worms each year of its life. Each mating, should produce twice that number, or since three hundred worms a year.
Certain style of earthworms, particularly those that come to the surface and crawl about during wet or rainy weather, seem to be chiefly active during the nocturnal hours. Other style -- which we will discuss booked -- are, apparently, active throughout highly of the day and nightfall. This species seldom, if ever, comes to the surface, depending on the porosity of the soil.
Except in parlous porous soils, the earthworm must eat its way through. Having no teeth, gadget before it, if not totally large to swallow, is sucked into the abyss. It is a ravenous eater.
Every morsel of soil and decayed vegetable again animal matter taken in by the earthworm passes being its digestive system. This is competent eclipse a gizzard-like organ. Here the handout value hold the swallowed doer is extracted for use by the worm. The push on is carried by muscular action down through, further out of, the alimentary canal. This scorched prime mover is called castings.