It Is With Logic That One Proves;

But All Of My Efforts Served Only To Make Me Better Acquainted With The Difficulty, Which In Itself Was Something.

Experiment Is The Sole Source Of Truth.

The Advance Of Science Is Not Comparable To The Changes Of A City, Where Old Edifices Are Pitilessly Torn Down To Give Place To New, But To The Continuous Evolution Of Zoologic Types Which Develop Ceaselessly And End By Becoming Unrecognisable To The Common Sight, But Where An Expert Eye Finds Always Traces Of The Prior Work Of The Centuries Past. One Must Not Think Then That The Old-fashioned Theories Have Been Sterile And Vain.

Experiment Is The Sole Source Of Truth. It Alone Can Teach Us Something New; It Alone Can Give Us Certainty.

In The Old Days When People Invented A New Function They Had Something Useful In Mind.