Observation Always Involves Theory.

Science Is The One Human Activity That Is Totally Progressive.

Wisdom Cannot Be Directly Transmitted, And Does Not Readily Accumulate Through The Ages.

Observations Always Involve Theory.

The Great Spirals, With Their Enormous Radial Velocities And Insensible Proper Motions, Apparently Lie Outside Our Solar System.

The Outstanding Feature, However, Is The Possibility That The Velocity-distance Relation May Represent The De Sitter Effect, And Hence That Numerical Data May Be Introduced Into Discussions Of The General Curvature Of Space.