Mysterious affair, electricity.

Put off your imagination, as you put off your overcoat, when you enter the laboratory. But put it on again, as you put on your overcoat, when you leave.

The true scientist never loses the faculty of amazement.

With all your science can you tell how it is, and whence it is, that light comes into the soul?

Most "scientists" are bottlewashers and button sorters.

If I had as many affairs as they say, I would now be speaking to you from inside a jar at the Harvard Medical School.

Certain things in our universe are fixed and absolute. The sun always rises in the east. Parking meters are always set to give an edge to the meter maid. And sons never phone.

The laws of biology are the fundamental lessons of history.

The theist is persuaded that while nothing that contradicts science is likely to be true, still nothing that stops with science can be the whole truth.

Handy guide to modern science: If it's green or it wriggles, it's biology. If it stinks, it's chemistry. If it doesn't work, it's physics.