I Feel That One Species, Mankind, Doesn't

Evolution Thus Is Merely Contingent On Certain Processes Articulated By Darwin: Variation And Selection.

A New Species Develops If A Population Which Has Become Geographically Isolated From Its Parental Species Acquires During This Period Of Isolation Characters Which Promote Or Guarantee Reproductive Isolation When The External Barriers Break Down.

To Take An Unequivocal Stand, It Seems To Me, Is Of Greater Heuristic Value And Far More Likely To Stimulate Constructive Criticism Than To Evade The Issue.

Biology Can Be Divided Into The Study Of Proximate Causes, The Study Of The Physiological Sciences (broadly Conceived), And Into The Study Of Ultimate (evolutionary) Causes, The Subject Of Natural History.

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