Roman calendar, a. [123].
Rotatory vibrations, b. [44].
Rudolphine tables, a. [270], [302].
Saros, a. [136].
Scholastic philosophy, a. [230].
School philosophy, a. [50].
Science, a. [42].
Secondary rocks, b. [513].
Secondary mechanical sciences, b. [23].
Second law of motion, a. [330].