These painters were, after all, true interpreters of nature. In infancy and early childhood the abdomen is much larger comparatively than in the grown person. For this there is a twofold cause; the larger size of the liver on the one hand, and the smaller development of the hips on the other. In a weakly child this appearance is exaggerated by its want of muscular power, which allows the intestines to become much distended with air. If the child is not merely weakly but also ricketty, the contracted chest will leave less room than natural for the lungs, while at the same time the ordinary development of the hips being arrested by the rickets, the disproportion is further increased both by that and by the flatulence due to the imperfect digestion with which the condition is almost always associated. In no case need the mere size of the abdomen occasion grave anxiety, so long as when the child lies upon its back the abdomen is uniformly soft, nor so long as even if tense it is not tender, and as it everywhere gives out a hollow sound like a drum when tapped with the finger. It is not for a moment meant that no notice is to be taken, nor opinion asked, as to the cause of excessive size of the abdomen, for its distension may be due to real disease; but it is yet worth while to remember that its mere size is not of itself evidence of disease, nor cause of grave anxiety. =Worms.=--There is no mistaking or overlooking the existence of _worms_ when they are really present. Their presence, however, is often suspected without any sufficient reason. Ravenous or uncertain appetite, indigestion, flatulence, undue size of the abdomen, a dark circle round the eyes, itching of the nose and of the entrance of the bowel, a coated tongue, and offensive breath are no real proof of the presence of worms, and do not justify the frequent repetition of violent purgatives or of so-called worm medicines. The only real proof of the presence of worms is their being seen in the evacuations. The worms commonly found in children are either the round-worm, which resembles the earth-worm, the thread-worm, or the tape-worm; the appearance of each of which is clearly indicated by its name. None of them are spontaneously generated in the body, but they are all introduced from without; their eggs, or, as they are technically called, their ova, being swallowed unperceived in some article of food, or drink. A proof of this is afforded by the fact that an infant, so long as it is nourished exclusively at the breast, never has worms.