Projective Geometry Is All Geometry.

And In Another Point Of View, I Think It Is Right That The Address Of A President Should Be On His Own Subject, And That Different Subjects Should Be Thus Brought In Turn Before The Meetings.

Metrical Geometry Is Thus A Part Of Descriptive Geometry, And Descriptive Geometry Is All Geometry.

So Much The Worse, It May Be, For A Particular Meeting: But The Meeting Is The Individual, Which On Evolution Principles, Must Be Sacrificed For The Development Of The Race.

As For Everything Else, So For A Mathematical Theory: Beauty Can Be Perceived But Not Explained.

Euclid Avoids It [the Treatment Of The Infinite]; In Modern Mathematics It Is Systematically Introduced, For Only Then Is Generality Obtained.