When about fifteen I once made a great scandal by taking out my knife in prayer meeting and assaulting a young man who, while I was kneeling down during the prayer, stood above me and squeezed my neck.

We are probably nearing the limit of all we can know about astronomy.

The result was that, if it happened to clear off after a cloudy evening, I frequently arose from my bed at any hour of the night or morning and walked two miles to the observatory to make some observation included in the programme.

One of the most beautiful hypotheses ever propounded in physics is ... the Dynamical Theory of Gases

Until I was four years old I lived in the house of my paternal grandfather, about two miles from the pretty little village of Wallace, at the mouth of the river of that name.

My father followed, during most of his life, the precarious occupation of a country school teacher.

My first undertaking in the way of scientific experiment was in the field of economics and psychology.