Although they do not warble before they can feed themselves, one need not wait for this to begin their instruction,[6] for it will succeed better, if one may say so, when infused with their food; since experience proves that they learn those airs more quickly, and remember them better, which they have been taught just after eating. It has been observed several times, that these birds, like the parrots, are never more attentive than during digestion. Nine months of regular and continued instruction are necessary before the bird acquires what amateurs call firmness, for if one ceases before this time, they spoil the air, by suppressing or displacing the different parts, and they often forget it entirely at their first moulting. In general it is a good thing to separate them from the other birds, even after they are perfect; because, owing to their great quickness in learning, they would spoil the air entirely by introducing wrong passages; they must be helped to continue the song when they stop, and the lesson must always be repeated whilst they are moulting, otherwise they will become mere chatterers, which would be doubly vexatious after having had much trouble in teaching them. DISEASES.—Those bullfinches which are caught in a snare or net are rarely ill, and may be preserved for eight years or more; but those reared from the nest are subject to many diseases, caused by their not having their natural food, or by those injurious delicacies which are always lavished on favorite birds; they rarely live more than six years. The surest means of preserving them healthy for a long time, is to give them neither sweets nor tit-bits of any kind, scrupulously to confine their food to rape seed, adding now and then a very little hemp seed to please them, and a good deal of the green food before mentioned. The bottom of their cages should be covered with river sand, as the bird there finds some stones which aid the functions of the stomach. Their most frequent diseases are moulting, costiveness, diarrhœa, epilepsy, grief, and melancholy, in which case they are quite silent, and remain immovable, unless the cause can be discovered. They must not be given any delicacy, and must be fed entirely on soaked rape seed. A clove in their water, proper food, and particularly a good deal of refreshing green food, enables them to pass the moulting time in good health. ----- [5] However difficult this pairing may be, it sometimes succeeds very well. A bullfinch and female canary once produced five young ones, which died on a journey which they could not bear. Their large beak, and the blackish down with which they were covered, showed that they were more like their father than mother.—_Translator._