The theory was emphasized in "Communist Manifesto" made by long-life friends Karl Marx and Friedrich Engels.
Thomas Malthus!
Karl Marx
Karl marx
the Bourgeoisie,
By performing experiments whose goal is to prove that such theory is a mistaken theory.
Economic Theory
Lamark's theory perhaps. Acquired characteristics clash with heredity.
Cesare Lombroso
"Middle class" currently and "market townspeople" historically are English equivalents of the French word bourgeoisie. The pronunciation of the feminine singular noun -- whose origins go back to the identification of the residents of bourgs(walled market-towns) -- will be "boor-zhwa-zee" in French.
I Have a feeling that it was Durkheim, as he has alot to do with family and comes up alot when looking at theories.
The idea that led to the atomic theory of matter, was John Dalton.
an epic.