because health is not a quality. It is not a thing like darkness in the hair or length in the limbs. It is a relation, a balance. You have a tall, strong man; but his very strength depends on his not being too tall for his strength. You catch a healthy, full-blooded fellow; but his very health depends on his being not too full of blood. A heart that is strong for a dwarf will be weak for a giant; a nervous system that would kill a man with a trace of a certain illness will sustain him to ninety if he has no trace of that illness. Nay, the same nervous system might kill him if he had an excess of some other comparatively healthy thing. Seeing, therefore, that there are apparently healthy people of all types, it is obvious that if you mate two of them, you may even then produce a discord out of two inconsistent harmonies. It is obvious that you can no more be certain of a good offspring than you can be certain of a good tune if you play two fine airs at once on the same piano. You can be even less certain of it in the more delicate case of beauty, of which the Eugenists talk a great deal. Marry two handsome people whose noses tend to the aquiline, and their baby (for all you know) may be a goblin with a nose like an enormous parrot's. Indeed, I actually know a case of this kind. The Eugenist has to settle, not the result of fixing one steady thing to a second steady thing; but what will happen when one toppling and dizzy equilibrium crashes into another.
This is the interesting conclusion. It is on this
