What is a machine?--A general comparison of a body and a machine--Details of the action of the machine--Physical explanation of the chief vital functions--The living body is a machine--The living machine constructive as well as destructive--The vital factor 19 Vital properties--The discovery of cells--The cell doctrine--The cell--The cellular structure of organisms--The cell wall--Protoplasm--The reign of protoplasm--The decline of the reign of protoplasm--The structure of protoplasm--The nucleus--Centrosome--Function of the nucleus--Cell division or karyokinesis--Fertilization of the egg--The significance of fertilization--What is protoplasm?--Reaction against the cell doctrine--Fundamenta…
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