"If you set pea-cock eggs under a hen, you should wait ten days before adding hen eggs to the nest, to insure them all hatching together, for the period of incubation of chicken eggs is thrice seven days and that of the eggs of pea-fowl is thrice nine. Sitting hens should be shut up day and night, except for a time in the morning and evening, when they are let out to eat and drink. "The keeper should make the rounds every few days and turn the eggs, so that they may be kept warm all over. It is said that you can tell whether an egg is fertile or sterile by putting it in water: for if it is sterile it will float, while if it is fertile it will sink. Those who shake their eggs to ascertain this fact make a mistake for thereby they destroy the germ in them. It is also said that you can tell a sterile egg by the fact that it is transparent when held against the light. "To preserve eggs they should be rubbed with fine salt or soaked for three or four hours in brine, and then cleaned off or packed in chaff or straw. Care should be taken to set eggs only in uneven numbers. The keeper can tell whether an egg is fertile or not four days after it is set, by holding it to the light, when he should throw it out if it is found to be empty and substitute another for it. "The new hatched chickens should be taken from every nest and given to a hen who has only a few to care for. When in this way a setting hen has less than half her eggs left unhatched, they should be taken from her and put under another hen which has eggs still unhatched. It is not well to give more than thirty chicks to a hen. Chicks should be fed for the first fifteen days in the dust to protect them from injuring their tender beaks on the hard ground: their diet being crushed barley mixed with cress seed and soaked in wine, for prepared in this way the grain is digestible. They should be kept away from water in the beginning. When they begin to have feathers on their legs the mites should be carefully picked off their heads and necks, for these banes often destroy them. Deer's horn should be burnt around their coops to keep snakes away, for the very smell of those vermin is fatal to young chickens. They should be allowed to run in the sun and to scratch in a dung heap, which serves to develop them. This rule applies not only to young chickens but also to the entire [Greek: ornithoboskeion], and should be practised all summer and even in winter on mild and sunny days. A net should be stretched over the chicken yard to keep the fowls themselves from flying out and to protect them from hawks and other birds of prey. Fowls should be protected from heat as well as cold, for both are harmful to them. When the chicks have got their feathers it is best to accustom them to follow one or two hens, leaving the other hens free to go to laying, in which occupation they are more useful than in rearing chicks.