Anticipations of the reaction of mechanical and scientific progress upon human life and thought

1931: A Glance at the Twentieth Century

A Hundred Years Hence: The Expectations of an Optimist

Ancient society

Die Welt in hundert Jahren

Looking forward

Der Weltverkehr Telegraphie und Post, Eisenbahnen und Schiffahrt, in ihrer Entwickelung dargestellt

Memories of the future

Icarus

Anthropology

Quo vadimus?

Civilization and its discontents