#### Quote of the day

It is to the middle class we must look for the safety of England.

#### Peter Guthrie Tait

**Born:**April 28, 1831

**Died:**July 4, 1901

**(aged 70)**

**Bio:**Peter Guthrie Tait was a Scottish mathematical physicist, best known for the mathematical physics textbook Treatise on Natural Philosophy, which he co-wrote with Kelvin, and his early investigations into knot theory, which contributed to the eventual formation of topology as a mathematical discipline. His name is known in graph theory mainly for Tait's conjecture.

**Known for:**

- Treatise on Natural Philosophy (1867)
- Sketch of thermodynamics (1868)
- Properties of Matter (1885)
- A treatise on the dynamics of a particle (1856)
- Principles of Mechanics and Dynamics