File:The pedigree of man - and other essays (1903) (14578104559).jpg

Identifier: pedigreeofmanoth00haec (find matches)
Title: The pedigree of man : and other essays
Year: 1903 (1900s)
Authors: Haeckel, Ernst Heinrich Philipp August, 1834-1919
Subjects: Man Evolution Man Evolution
Publisher: London : A and H.B. Bonner
Contributing Library: ASC - York University Libraries
Digitizing Sponsor: York University - University of Toronto Libraries

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126 THE DIVISION OF LABOR. Fig. 22 A soul-cell or ganglion-cell from the brain of an electric fish(Torpedo). In the middle of the large ramified cell lies thenucleus, enclosing a nucleolus and most internally a nucleo-linus. The protoplasm of the cell is traversed by many verydelicate fibrilla3. The poles or extensions of the branchingcell go partly to nerve-threads (a), serve partly (b) for put-ting this particular soul-cell into relationship with others. walls of the stomach and effect the involuntary move-ments of this organ, are made up of smooth, unstriated,fusiform cells. Finally, the nervous system, highestset of organs in the animal body, subservient to sensa-tion, will, thought, consciousness, in a word, to the so-
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Fig. 23. The ovum of man, very strongly magnified. The ovum-cell(l-5th inch in diameter) is surrounded by a finely striatedyolk-membrane, and contains a clear germinal vesicle witha dark germinal spot. THE DIVISION OF LABOR. 127 called soul-functions or spiritual life, is composed oflarge stellate cells, of soul-cells, whose ramifying ex-tensions are connected with the nerve-fibres or delicatealbuminoid fibres, extending from the cells (Fig. 22). Different in kind as are the above-named cells, thaton microscopic investigation wc find interwoven onewith the other, all have but evolved by specialisationfrom a single primitive form of cell, viz., from thathomogeneous, simplest cell to which the egg, at thecommencement of the animals development, givesorigin. Every animal is at the commencement of itsindividual existence a simple ovum (Fig. 23). Butthis egg is in its turn a simple cell, consisting of thesame essential parts as every other cell of the gela-tinous cell-substance (here calle

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