Where, however, it is inconvenient to gratify the desire, one or two doses of jalap will often entirely remove it; and fowls often lay in three weeks afterward. Some place the would-be sitter in an aviary, for four or five days at most, and feed her but sparingly; from the commencement of her confinement, she will gradually leave off clucking, and when this has ceased, she may be again set free, without manifesting the least desire to take to the nest again, and in a short time the hen will commence laying with renewed vigor. The barbarous measures sometimes resorted to should be frowned upon by every person with humane feelings. Three weeks is the period of incubation; though chickens are sometimes excluded on the eighteenth day. When the hen does not sit close for the first day or two, or in early spring, it will occasionally be some hours longer; when the hen is assiduous, and the weather hot, the time will be a trifle shorter. Chickens have been known to come out as late as the twenty-seventh day. It may not be uninteresting to note the changes which the egg passes through in hatching. In _twelve hours_, traces of the head and body of the chicken may be discerned; at the end of the _second day_, it assumes the form of a horse-shoe, but no red blood as yet is seen; at the _fiftieth hour_, two vesicles of blood, the rudiments of the heart, may be distinguished, one resembling a noose folded down on itself, and pulsating distinctly; at the end of _seventy hours_, the wings may be seen, and, in the head, the brain and the bill, in the form of bubbles; toward the end of the _fourth day_, the heart is more completely formed; and on the _fifth day_, the liver is discernible; at the end of _one hundred and thirty hours_, the first voluntary motions may be observed; in _seven hours_ more, the lungs and stomach appear; and, _in four hours_ after this, the intestines, the loins, and the upper jaw. At the end of the one _hundred and forty-fourth hour_, two drops of blood are observable in the heart, which is also further developed; and, on the _seventh day_, the brain exhibits some consistence. At the _one hundred and ninetieth hour_, the bill opens, and the muscular flesh appears on the breast; in _four hours_ more, the breast bone is seen; and, in _six hours_ afterward, the ribs may be observed forming from the back. At the expiration of _two hundred and thirty-six hours_, the bill assumes a green color, and, if the chicken be taken out of the egg, it will visibly move. At _two hundred and sixty-four hours_, the eyes appear; at _two hundred and eighty-eight hours_, the ribs are perfect; and _at three hundred and thirty-one hours_, the spleen approaches near to the stomach, and the lungs to the chest; at the end of _three hundred and fifty-five hours_, the bill frequently opens and shuts. At the end of the _eighteenth day_, the first cry of the chicken is heard; and it gradually acquires more strength, till it is enabled to release itself