Time was when I was unknown. I am the unknown quantity in mathematics. I have been discovered, and I have been applied to the solution of problems. I have been used to aid in the discovery of the properties of matter, and have been made the foundation of the science of astronomy. I have been applied to the solution of questions in mechanics and chemistry, and have been made the basis of the science of calculation. I have been used to aid in the discovery of the properties of light and sound, and have been made the foundation of the science of optics and acoustics. I have been applied to the solution of questions in the science of living beings, and have been made the basis of the science of biology. I am the unknown quantity in mathematics, and the unknown time in history
