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Most Scientific Problems Are Far Better Understood By Studying Their History Than Their Logic.

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.

Anyone Who Writes About "darwin's Theory Of Evolutionin The Singular, Without Segregating The Theories Of Gradual Evolution, Common Descent, Speciation, And The Mechanism Of Natural Selection, Will Be Quite Unable To Discuss The Subject Competently.

Every Politician, Clergyman, Educator, Or Physician, In Short, Anyone Dealing With Human Individuals, Is Bound To Make Grave Mistakes If He Ignores These Two Great Truths Of Population Zoology: (1) No Two Individuals Are Alike, And (2) Both Environment And Genetic Endowment Make A Contribution To Nearly Every Trait.

Two Forms Or Species Are Sympatric, If They Occur Together, That Is If Their Areas Of Distribution Overlap Or Coincide. Two Forms (or Species) Are Allapatric, If They Do Not Occur Together, That Is If They Exclude Each Other Geographically. The Term Allopatric Is Primarily Useful In Denoting Geographic Representatives.