Never Think That You Already Know All.

One Can Truly Say That The Irresistible Progress Of Natural Science Since The Time Of Galileo Has Made Its First Halt Before The Study Of The Higher Parts Of The Brain, The Organ Of The Most Complicated Relations Of The Animal To The External World. And It Seems, And Not Without Reason, That Now Is The Really Critical Moment For Natural Science; For The Brain, In Its Highest Complexity-the Human Brain-which Created And Creates Natural Science, Itself Becomes The Object Of This Science.

The Digestive Canal Represents A Tube Passing Through The Entire Organism And Communicating With The External World, I.e. As It Were The External Surface Of The Body, But Turned Inwards And Thus Hidden In The Organism.

Learn, Compare, Collect The Facts!

Perfect As The Wing Of A Bird May Be, It Will Never Enable The Bird To Fly If Unsupported By The Air. Facts Are The Air Of Science. Without Them A Man Of Science Can Never Rise.

Never Think That You Already Know All. However Highly You Are Appraised, Always Have The Courage To Say To Yourself-i Am Ignorant.