Letter sets

Scientific Networks

Friendship and trust

Friendship and information exchange

Darwin as mentor

Darwin’s mentors

Crossing class boundaries

Gender

Scientific practice

Scientific specialism and detail

Experimental practice

Using microscopes

Collecting specimens

Theory and practice

Darwin women

Controversy

Priority dispute

Disagreement and respect

Darwin and Owen

Misunderstandings concerning natural selection

The conduct of debate

Natural selection and humans

Religion

Design

Personal belief and the nature of God

Beauty