I liked numbers because they were solid, invariant; they stood unmoved in a chaotic world. There was in numbers and their relation something absolute, certain, not to be questioned, beyond doubt.

[photography]... wanted to understand, to master for myself, all the processes involved, and to manipulate them in my own way.

I was on the shy side at school (one school report called me ‘diffident’) and Braefield had added a special timidity, but when I had a natural wonder... I lost all my diffidence, and freely approached others, all my fear forgotten.

My mother showed me that when tin or zinc was bent it uttered a special ‘cry’. ‘It’s due to deformation of the crystal structure,’ she said, forgetting that I was five, and could not understand her - and yet her words fascinated me, made me want to know more.

A union of literary and scientific cultures – there was not the dissociation of sensibility that was so soon to come ... Davy himself was writing (and sometimes publishing) a good deal of poetry at the time; his notebooks mix details of chemical experiments, poems, and philosophical reflections all together; and these did not seem to exist in separate compartments in his mind.