ANSWER.--This is undoubtedly a lung trouble, for on dissecting the birds, I have always found the lungs not only highly inflamed but nearly gone. For years I had supposed this disease incurable, and incidental to bird and clime, but later experience has convinced me that it is not only largely under control but easily anticipated. First, I never knew a case in summer or early spring, when the birds were not confined to buildings but had free and open range, and only when confined during inclement weather, so that it is more or less a denizen of foul air and filthy quarters. I would much rather have my breeding houses freeze a little than to have them filled with foetid air, and the birds breathe over and over again the ammonia arising from their own excrements. It is one thing for the birds to be confined over their own ordure, their nostrils but a few inches from it, but quite another with the attendant in the walk with his nose six feet away. He may think his buildings quite clean and free from noxious gases, but could his ducks speak they would tell him a different story. This disease, if taken in the early stages, can usually be cured. Isolate the bird with the first appearance of trouble, in a warm, dry place. Feed on food formula for little ducklings. Mix a little cayenne pepper in the food, a little Douglas Mixture in the drinking water, and a large proportion of the affected birds may be saved. Keep your breeding birds dry and clean when confined. QUESTION 6.--I turned my ducklings out in a grass plot today and have lost nearly one-third of them. What is the cause? ANSWER.--This may result from two causes. Ducklings from two to four weeks old are ravenous birds and will devour all manner of insects within their reach, which they do not stop to kill. Bees, wasps, hornets and beetles of all descriptions are acceptable, and the little birds, themselves, often pay the penalty with their lives. Again, at that age, they are extremely sensitive to the heat of the sun, and they must have shade. Years ago, we sometimes lost twenty birds out of a hundred in thirty minutes, before we knew the cause. QUESTION 7.--How many birds should constitute a breeding-yard? ANSWER.--Twenty-five is enough unless the birds have free range, then fifty may run together with safety. QUESTION 8.--How shall I proportion the sexes for the best results? ANSWER.--Five ducks to one drake. Later in the season, six or eight ducks to one drake. QUESTION 9.--How can I distinguish the sexes? ANSWER.--It is easy for the expert to detect the sex of the bird when very young. The drake has a longer bill, neck and body, with a more upright carriage. At two months old the duck may be distinguished by her coarse quack, the drake by a fine, rasping noise, and later on by the curled feathers in his tail. QUESTION 10.--How soon will a young duck begin laying?