In the seventh month my child did _not_ recognize his nurse, to whom he had for months been accustomed, after an absence of four weeks. Another child, however, at four months noticed at evening the absence of his nurse, who had been gone only a day, and cried lustily upon the discovery, looking all about the room, and crying again every time after searching in vain (Wyma, 1881). At ten months the same child used to be troubled by the absence of his parents, though he bore himself with indifference toward them when he saw them again. At this period a single nine-pin out of the whole set could not be taken away without his noticing it, and at the age of a year and a half this child knew at once whether one of his ten animals was missing or not. In the nineteenth and twenty-first months my boy recognized his father immediately from a distance, after a separation of several days, and once after two weeks' absence; and in his twenty-third month his joy at seeing again his playthings after an absence of eleven and a half weeks (with his parents) was very lively, great as was the child's forgetfulness in other respects at this period. A favorite toy could often be taken from him without its being noticed or once asked for. But when the child--in his eighteenth month--after having been accustomed to bring to his mother two towels which he would afterward carry back to their place, on one occasion had only one towel given back to him, he came with inquiring look and tone to get the second. This observation, which is confirmed by some similar ones, proves that at a year and a half the memory for visual and motor ideas that belong together was already well developed without the knowledge of the corresponding words. But artificial associations of this sort need continual renewing, otherwise they are soon forgotten; the remembrance of them is speedily lost even in the years of childhood. It is noteworthy, in connection with this, that what has been lately acquired, e. g., verses learned by heart, can be recited more fluently during sleep than in the waking condition. At the age of three years and five months a girl recited a stanza of five lines on the occasion of a birthday festival, not without some stumbling, but one night soon after the birthday she repeated the whole of the rhymes aloud in her sleep without stumbling at all (Frau von Struempell).