A child goes to bed quite well, or at the worst having seemed slightly ailing and feverish for a day or two, and on waking in the morning it is suddenly discovered that power is lost over one leg or both, or over both arm and leg of one side. The loss of power is at first seldom complete, though neither arm nor leg can be used to any good purpose, and during the ensuing twenty-four hours the palsy often grows worse, and sometimes affects one or both limbs of the opposite side. After that time recovery in general begins. It is now and then speedy, so that in three or four days all trace of the paralysis may have disappeared. This, however, is a fortunate exception to the general rule, which is that amendment is very tardy, showing itself first in the arm, afterwards in the leg, and, if both sides have been affected, more on one side than on the other. Unless the improvement is very rapid, it is almost always only partial, and the palsied limb, though it does not lose sensation, regains but little power; it grows much more slowly than the other, is always colder and wastes considerably, while, some muscles still retaining more power than others, it becomes twisted out of shape, and requires all the skill of the orthopaedic surgeon to remedy or at least to lessen the consequent deformity. It has been ascertained that this form of palsy depends on a state of congestion, or overfilling of the minute blood-vessels of the spinal marrow. When the child gets well the congestion has passed away; but it does this speedily, and recovery is then rapid as well as complete. If it does not soon pass away, other changes take place in the spinal marrow, and recovery is then slow, incomplete, or even does not take place at all. Remedies are unfortunately of little avail here, but it is evident that when the palsy is quite recent all movement of the limb must be mischievous, and that the congestion of the spinal marrow to which it is due will be most likely to abate under the influence of perfect quiet, rest in bed, and soothing or fever medicines, or of such as are calculated to overcome constipation, or to correct any fault of digestion, while the importance of teething, and the possible expediency of lancing the gums must not be forgotten.