Cases in which this condition of the lungs exists usually present the history of the child from the very first having failed to utter a strong and loud cry like that of other children. Even after breathing has gone on for some time, such children usually appear feeble, and they suck with difficulty, although they often make the effort. An infant thus affected sleeps even more than new-born infants usually do; its voice is very feeble, and rather a whimper than a cry. In the cry of the healthy infant you at once detect two parts--the loud cry, suffering or passionate as the case may be, and the less loud back draught of inspiration. The French have two words for these two sounds--the _cri_ and the _reprise_. The _cri_ is feeble, the _reprise_ is altogether wanting wherever expansion of the lung has to any considerable extent failed to take place, and you would hail this second sound as the best proof of an improvement in the child's condition. If you watch the child with a little attention you will see that while the chest moves up and down, it is very little, if at all, dilated by the respiratory movements. The temperature falls, the skin becomes pale, and the lips grow livid, and often slight twitching is observed about the muscles of the face. The difficulty in sucking increases, the cry grows weaker and more whimpering, or even altogether inaudible, while breathing is attended with a slight rattle or a feeble cough, and the convulsive movements return more frequently, and are no longer confined to the face, but affect also the muscles of the extremities. Any sudden movement suffices to bring on these convulsive seizures, but even while perfectly still the child's condition is not uniform, but it will suddenly become convulsed, and during this seizure the respiration will be extremely difficult, and death will seem momentarily impending. In a few minutes, however, all this disturbance ceases, and the extreme weakness of the child, its inability to suck, its feeble cry, and its frequent and imperfect inspirations, are the only abiding indications of the serious disorder from which it suffers. But the other symptoms return again and again, until after the lapse of a few days or a few weeks the infant dies. I have dwelt at some length on this condition because it is important to know that during the first few weeks of life real inflammation of the lungs or air-tubes is of extremely rare occurrence, and that the symptoms which are not infrequently supposed to depend on it are really due to a portion of the lung more or less extensive never having been called into proper activity. I may add that we shall hereafter have to notice a similar condition of the lung--its collapse after having once been inflated--as occurring sometimes in the course of real inflammation of the organs of respiration in early life, and forming a very serious complication of the original disease.