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Updated: May 21, 2025
The comb is made of wax and is multicellular, each cell in it having six sides or as many as nature has given the bee feet. It is said that bees do not gather from the same plants all the materials which enter in these four substances which they manufacture, namely: propolis, erithacen, wax and honey.
The transit, we are told, from the unicellular to the multicellular organism cannot be explained by individualism, but implies a diminution of the competitive, an increase of the social and subordinative tendency.
The Gastraea itself has originated from the simple multicellular vesicle, the Blastaea, and this in turn must have been evolved from the lowest circle of unicellular animals, to which we give the name of Protozoa. We have already considered the most important primitive type of these, the unicellular Amoeba, which is extremely instructive when compared with the human ovum.
It is a source of evidence that has told us of most of the steps in the progress from the single-celled animal to the multicellular organisms, and gives us the clearest idea of the fundamental principles which have been concerned in the evolution of life and the construction of the complicated machine out of the simple bit of protoplasm.
From one or more simple primitive unicellular forms have arisen the great multitude of multicellular forms that now exist. Popularly, Darwin's theory is supposed to be that man sprang from the apes, but this, strictly speaking, is a misconception.
Protophytes. : 2. Algaria. Unicellular algae. : 2. Paulotomea. Palmellacea. Eremosphaera. 3 to 5. Protozoa. : 3. Lobosa. Amoebina. Amoeba Leucocyta. 3 to 5. Protozoa. : 4. Infusoria. Unicellular. : 4. Flagellata. Euflagellata. Zoomonades. 3 to 5. Protozoa. : 5. Blastaeades. Multicellular hollow spheres. : 5. Catallacta. Magosphaera, Volvocina, Blastula. 6 to 8.
The first cell-communities to be formed, which laid the early foundation of the higher multicellular body, must have consisted of homogeneous and simple amoeboid cells. The oldest Amoebae lived isolated lives, and even the amoeboid cells that were formed by the segmentation of these unicellular organisms must have continued to live independently for a long time.
These same main divisions of soul-activity, which are to be met with in the single-celled organism, the phenomena of irritability, sensation, and motion, can be shown to exist in all multicellular organisms as functions of the cells of which their bodies are composed.
The egg, in the modern physiological sense of the word, did not make its appearance until the descendants of the unicellular Protozoon had developed into multicellular animals, and these had undergone sexual differentiation.
The gut is the oldest of all the organs of the metazoic body, and it leads us back to the earliest age of the formation of organs to the first section of the Laurentian period. As we have already seen, the result of the first division of labour among the homogeneous cells of the earliest multicellular animal body was the formation of an alimentary cavity.
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