regulations; then we shall see whether the result accords with our design.

What do you mean?

What I mean may be put into the form of a question, I said: Are dogs divided into hes and shes, or do they both share equally in hunting and in keeping watch and in the other duties of dogs? or do we entrust to the males the entire and exclusive care of the flocks, while we leave the females at home, under the idea that the bearing and suckling their puppies is labour enough for them?

No, he said, they share alike; the only difference between them is that the males are stronger and the females weaker.

But can you use different animals for the same purpose, unless they are bred and fed in the same way?