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

Flight by machines heavier than air is unpractical and insignificant, if not utterly impossible.

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

Quite likely the twentieth century is destined to see the natural forces which will enable us to fly from continent to continent with a speed far exceeding that of a bird.

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

Aerial flight is one of that class of problems with which man will never be able to cope.

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.