yet realized the full significance of what she has discovered, and her hands are raised as if to shade her eyes from the unaccustomed glare that is bursting upon her. From the dark cavern of universal dead matter, she has stepped out into the glare of the noon-day sun of a Universe All-Alive even to its smallest and apparently most inert particle.
Beginning at Man, the highest form of Life known to us, we may pass rapidly down the scale of animal life, seeing life in full operation at each descending step. Passing from the animal to the vegetable kingdom, we still see Life in full operation, although in lessened degrees of expression. We shall not stop here to review the many manifestations of Life among the forms of plant-life, for we shall have occasion to mention them in our next lesson, but it must be apparent to all that Life is constantly manifesting in the sprouting of seeds; the putting forth of stalk, leaves, blossoms, fruit, etc., and in the enormous manifestation of force and energy in such growth and development. One may see the life force in the plant pressing forth for expression and manifestation, from the first sprouting of the seed, until the last vital action on the part of the mature plant or tree.
Besides the vital action observable in the growth and development of plants, we know, of course, that plants sicken and die, and manifest all other attributes of living forms. There is no room for argument about the presence of life in the plant kingdom.
But there are other forms of life far below the scale of the plants. There is the world of the bacteria, microbes, infusoria—the groups of cells with a common life—the single cell creatures, down to the Monera, the creatures lower than the single cells—the Things of the slime of the ocean bed.
These tiny Things—living Things—present to the sight merely a tiny speck of jelly, without organs of any kind. And yet they exercise all the functions of life—movement, nutrition, reproduction, sensation, and dissolution. Some of these elementary forms are all stomach, that is they are all one organ capable of performing all the functions necessary for the life of the animal. The creature has no mouth, but when it wishes to devour an object it simply envelopes it—wraps itself around it like a bit of glue around a gnat, and then absorbs the substance of its prey through its whole body.
Scientists have turned some of these tiny creatures inside out, and yet they have gone on with their life functions undisturbed and untroubled. They have cut them up into still tinier bits, and yet each bit lived on as a separate animal, performing all of its functions undisturbed. They are all the same all over, and all the way through. They reproduce themselves by growing to a certain size, and then separating into two, and so on. The rapidity of the increase is most remarkable.
Haekel says of the Monera: "The Monera are the simplest permanent cytods. Their entire body consists of merely soft, structureless plasm. However thoroughly we may examine them with the help of the most delicate reagents and the strongest optical instruments, we yet find that all the parts are completely homogeneous. These Monera are therefore, in the strictest sense of the word, 'organisms without organs,' or even in a strict philosophical sense they might not even be called organisms, since they possess no organs and since they are not composed of various particles. They can only be called organisms in so far as they are capable of exercising the organic phenomena of life, of nutrition, reproduction, sensation and movement."
Verworn records an interesting instance of life and mind among the Rhizopods, a very low form of living thing. He relates that the Difflugia ampula, a creature occupying a tiny shell formed of minute particles of sand, has a long projection of its substance, like a feeler or tendril, with which it searches on the bottom of the sea for sandy material with which to build the shell or outer covering for its offspring, which are born by division from the parent body. It grasps the particle of sand by the feeler, and passes it into its body by enclosing it. Verworn removed the sand from the bottom of the tank, replacing it by very minute particles of highly colored glass. Shortly afterward he noticed a collection of these particles of glass in the body of the creature, and a little later he saw a tiny speck of protoplasm emitted from the parent by separation. At the same time he noticed that the bits of glass collected by the mother creature were passed out and placed around the body of the new creature, and cemented together by a substance secreted by the body of the parent, thus forming a shell and covering for the offspring. This proceeding showed the presence of a mental something sufficient to cause the creature to prepare a shell for the offspring previous to its birth—or rather to gather the material for such shell, to be afterward used; to distinguish the proper material; to mould it into shape, and cement it. The scientist reported that a creature always gathered just exactly enough sand for its purpose—never too little, and never an excess. And this in a creature that is little more than a tiny drop of glue!
We may consider the life actions of the Moneron a little further, for it is the lowest form of so-called "living matter"—the point at which living forms pass off into non-living forms (so-called). This tiny speck of glue—an organism without organs—is endowed with the faculty called sensation. It draws away from that which is likely to injure it, and toward that which it desires—all in response to an elementary sensation. It has the instinct of self-preservation and self-protection. It seeks and finds its prey, and then eats, digests and assimilates it. It is able to move about by "false-feet," or bits of its body which it pushes forth at will from any part of its substance. It reproduces itself, as we have seen, by separation and self-division.
The life of the bacteria and germs—the yeasty forms of life—are familiar to many of us. And yet there are forms of life still below these. The line between living forms and non-living forms is being set back further and further by science. Living creatures are now known that resemble the non-living so closely that the line cannot be definitely drawn.
Living creatures are known that are capable of being dried and laid away for several years, and then may be revived by the application of moisture. They resemble dust, but are full of life and function. Certain forms of bacilli are known to Science that have been subjected to degrees of heat and cold that are but terms to any but the scientific mind.
Low forms of life called Diatoms or "living crystals" are known. They are tiny geometrical forms. They are composed of a tiny drop of plasm, resembling glue, covered by a thin shell of siliceous or sandy material. They are visible only through the microscope, and are so small that thousands of them might be gathered together on the head of a pin. They are so like chemical crystals that it requires a shrewd and careful observer to distinguish them. And yet they are alive, and perform all the functions of life.
Leaving these creatures, we enter the kingdom of the crystals, in our search for life. Yes, the crystals manifest life, as strange as this statement may appear to those who have not followed the march of Science. The crystals are born, grow, live, and may be killed by chemicals or electricity. Science has added a new department called "Plasmology," the purpose of which is the study of crystal life. Some investigators have progressed so far as to claim that they have discovered signs of rudimentary sex functioning among crystals. At any rate, crystals are born and grow like living things. As a recent scientific writer has said: "Crystallization, as we are to learn now, is not a mere mechanical grouping of dead atoms. It is a birth."
The crystal forms from the mother liquor, and its body is built up systematically, regularly, and according to a well defined plan or pattern, just as are the body and bones of the animal form, and the wood and bark of the tree. There is life at work in the growth of the crystal. And not only does the crystal grow, but it also reproduces itself by separation or splitting-off, just as is the case with the lower forms of life, just mentioned.
The principal point of difference between the growth and development of the crystals and that of the lower forms of life referred to is that the crystal takes its nourishment from the outside, and builds up from its outer surface, while the Monera absorbs its nourishment from within, and grows outwardly from within. If the crystal had a soft center, and took its nourishment in that way, it would be almost identical with the Diatom, or, if the Diatom grew from the outside, it would be but a
