Geometry without axioms; or the first book of Euclid's elements. With alterations and familiar notes; and an intercalary book in which the straight line and plane are derived from properties of the sphere ... To which is added an appendix ...

Mode of access: Internet.

Democracy,

Natural rights of man.--Principles of democracy.--The Constitution.--Political economy.--Social welfare.--Religion.--Foreign affairs.--Appendix: 1. Axioms and dicta. II. Opinion of contemporaries. III. Select bibliography (p. 283-285)

Popular lectures on scientific subject,

First published in 1881.

Prinzipien der Mathematik /

Photocopy of typescript.