There are two ways of crossing applicable to any breed, both of which have had their earnest partisans. So much clamor has been made about them, I think, only because they have been simultaneously used and often mingled, and the results have been deranged by their use. This might have been avoided by commencing with the simplest and continuing with the best.

The first may be called the renewal of a breed within itself, or interbreeding; the second, improving by foreign blood. We will pass them rapidly in review, trying to reach in the results the solid basis of truth.