MEANS OF COMMUNICATION.--The noise of crying or rather of squalling, as no tears are shed for a long time, is of course uttered in an instinctive manner, but serves to show that there is suffering. After a time the sound differs according to the cause, such as hunger or pain. This was noticed when this infant was eleven weeks old, and I believe at an earlier age in another infant. Moreover, he appeared soon to learn to begin crying voluntarily, or to wrinkle his face in the manner proper to the occasion, so as to show that he wanted something. When 46 days old, he first made little noises without any meaning to please himself, and these soon became varied. An incipient laugh was observed on the 113th day, but much earlier in another infant. At this date I thought, as already remarked, that he began to try to imitate sounds, as he certainly did at a considerably later period. When five and a half months old, he uttered an articulate sound “da,” but without any meaning attached to it. When a little over a year old, he used gestures to explain his wishes; to give a simple instance, he picked up a bit of paper, and, giving it to me, pointed to the fire, as he had often seen and liked to see paper burnt. At exactly the age of a year, he made the great step of inventing a word for food, namely, _mum_, but what led him to it I did not discover. And now, instead of beginning to cry when he was hungry, he used this word in a demonstrative manner or as a verb, implying “Give me food.” This word, therefore, corresponds with _ham_, as used by M. Taine’s infant at the later age of fourteen months. But he also used _mum_ as a substantive of wide signification; thus he called sugar _shu-mum_, and a little later after he had learned the word ‘black,’ he called liquorice _black-shu-mum_--black-sugar-food.