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Updated: May 24, 2025
We are justified in concluding that they were at least as rudimentary in structure and life as the lowest inhabitants of nature to-day. The distinction of being the lowest known living organisms should, I think, be awarded to certain one-celled vegetal organisms which are very common in nature.
It has been already pointed out that respiration is in all animals, in the end, the same process. The one-celled animal and the muscle-cell respire in the same way, and with the same results oxidation, combustion, and resulting waste products.
Material eyes are but the windows of the Soul, and your environment has so beclouded your vision that you grasp but little of the real things beyond. All material expressions of the Father, from the simplest chemical element to the most complex compound; from the one-celled protoplasmic life germ to the most complex organism, are Vibratory in their ultimate nature.
We actually do find colonies of unicellular animals much like amoeba, so that the muscle-cells and all other cells of the body may be compared to amoeba and other one-celled animals. But while in such unicellular creatures all functions are properties of the individual cell, among higher forms systems take the place of the protoplasm of the single cell.
Their structural plans are far more varied, and they range more widely from higher and relatively complicated organisms to the unitary one-celled animals. A knowledge of some of them is essential for our present purpose, which is to learn how sure is the basis for the principles of relationship and how complete is the structural evidence of evolution.
Numbers of the Protozoa are social; they live either in a common jelly-like matrix, or on a common stalk. In fact, we have a singularly instructive illustration of the process in the evolution of the sponges. It is well known that the horny texture to which we commonly give the name of sponge is the former tenement and shelter of a colony of one-celled animals, which are the real Sponges.
Thus the one-celled egg has transformed into something that it was not at first, and in doing this it has proved the possibility and the reality of organic reconstruction. The tadpole breathes by means of its gills, and it is at first entirely devoid of the lungs which the adult frog possesses and uses.
Back of the group of primates lies a far less developed set of insectivorous animals, behind them the reptiles, behind them the fishes. When we get back this far we are less certain but most probably the worms take up the story. So our ancestry runs back to the very beginning, when it originated in the one-celled animals which are also the ancestors of all the rest of the animal world.
Watching them day by day we see the small one-celled egg spheres divide into more and more numerous portions which are the daughter-cells, destined to form by their products the many varied tissues and organs of the developing larva and adult frog.
Some assert that all alleged instances of protective colouring and mimicry are merely the result of accident; while at the opposite swing of the pendulum we find theories, protective and mimetic, for the colours of even the tiny one-celled green plants which cover the bark of trees! Here is abundant opportunity for any observer of living nature to help toward the solution of these problems.
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