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

The beginning of 1856 found me teaching in the family of a planter named Bryan, residing in Prince George County, Md., some fifteen or twenty miles from Washington.

As years passed away I have formed the habit of looking back upon that former self as upon another person, the remembrance of whose emotions has been a solace in adversity and added zest to the enjoyment of prosperity.

All attempts at artificial aviation are not only dangerous to human life, but foredoomed to failure from the engineering standpoint.

As the existence of a corps of professors of mathematics is peculiar to our navy, as well as an apparent, perhaps a real, anomaly, some account of it may be of interest.

My father was the most rational and the most dispassionate of men.

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