demarcation

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References in classic literature ?
On the view that species are only strongly marked and permanent varieties, and that each species first existed as a variety, we can see why it is that no line of demarcation can be drawn between species, commonly supposed to have been produced by special acts of creation, and varieties which are acknowledged to have been produced by secondary laws.
At any garrisoned point where the line of demarcation between one country and another is so very narrow as at Niagara, desertion from the ranks can scarcely fail to be of frequent occurrence: and it may be reasonably supposed that when the soldiers entertain the wildest and maddest hopes of the fortune and independence that await them on the other side, the impulse to play traitor, which such a place suggests to dishonest minds, is not weakened.
The line of demarcation between the two colours, black and blue, showed the point which the pure sea would not pass; but it lay as quiet as the abominable pool, with which it never mixed.
There appeared to be no line of demarcation between the young person's excessive innocence, and another person's guiltiest knowledge.