=Growing ducklings.= For a poultry keeper who has only a little room it is much easier to grow a few ducks than to grow an equal number of chickens. There are two reasons for this: One is that the ducklings stand close confinement better and are not so sensitive to unsanitary conditions; the other is that ducks of the improved breeds grow much more quickly than chickens and are grown up before the novelty of caring for them wears off and the keeper tires of giving the close attention that young poultry need when grown under such conditions. The ducks of the improved breeds are mostly non-sitters. Unless one has common ducks, Muscovy Ducks, Rouen Ducks with some wild Mallard blood, or Mallards not long domesticated, he is not likely to have a duck "go broody," and so small lots of duck eggs are usually hatched under hens. As duck eggs are larger than hen eggs, a smaller number is given to the hen. Eleven medium-sized duck eggs are given to a hen that would cover thirteen hen eggs. If the eggs are large, it is better to give such a hen only nine. The development of a fertile duck egg that has a white or slightly tinted shell can be seen very plainly when the egg is held before a light, much earlier than the development of a hen egg. If the shell is green and quite dark in color, the development of the germ may not show any better than in a brown-shelled hen egg. The period of incubation is about four weeks. Eggs are sometimes picked as early as the twenty-fifth day, but usually on the twenty-sixth day. As stated in Chapter II, the duckling usually waits quite a long time after chipping the shell before it completes the process and emerges.