There Is More To Biology Than Rats,

Our Understanding Of The World Is Achieved More Effectively By Conceptual Improvements Than By Discovery Of New Facts

Wherever We Look At The Living Biota … Discontinuities Are Overwhelmingly Frequent…the Discontinuities Are Even More Striking In The Fossil Record. New Species Usually Appear In The Fossil Record Suddenly, Not Connected With Their Ancestors By A Series Of Intermediates.

Scientific Progress Consists In The Development Of New Concepts.

It Seems To Me That For Darwin The Pulsing Of Evolutionary Rates Was A Strictly Vertical Phenomenon.

Evolution ... Is Opportunistic, Hence Unpredictable.