A social evolution considered that technological growth and social evolution are related to each other. His classification for the social evolution can be given as

Savagery

Barbarism

Civilization

Upper-instrumental
Development
Bow and Arrow Upper-Discovery of iron Use of phonetic language
and script

Middle- Fire and
fishing Middle - Domestication
of animals
and Agriculture
Lower-Substence
on print Lower- Development
of pottery

Marriage and family

Deeply influenced Engels and has writing based on the major anthropological work Iroquois of Polynesia. The different stages stated are:

Stage

Characteristics

Agamy Marriage Less And Indifferent Towards Sex

Primitive Promiscuity Without Restrictions And No Taboo Regarding Incest

Consanguine Family Same Generation Marriage Between Brother And Sister

Punalvant Family Group Marriage Between Men And Women With One Male
Group Having Sexual Relation With Any Female

Syndasmian Marriage Between Two Opposite Sex, But Freedom To Male To
Have Relation With Any Female.

Patriarchal Male Dominance Over Female

Monogamous Family Present Stage Of Marriage

Descriptive And Classificatory Terminology

Morgan has given single term for specific individual's relation which is characterized by firstly divergence is kept in linear relationship and collateral relationship are distinguished secondly the term also describe blood relationship.

Important Books:

System of consanguinity and affinity of the human family (1870)
Ancient society (1877)

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