A FOURTH child has the strength of his weakness. Being of no great value, he may throw himself away if he likes, and never be missed. Charles Francis Adams, the father, felt no love for Europe, which, as he and all the world agreed, unfitted Americans for America. A captious critic might have replied that all the success he or his father or his grandfather achieved was chiefly due to the field that Europe gave them, and it was more than likely that without the help of Europe they would have all remained local politicians or lawyers, like their neighbors, to the end. Strictly followed, the rule would have obliged them never to quit Quincy; and, in fact, so much more timid are parents for their children than for themselves, that Mr. and Mrs. Adams would have been content to see their children remain forever in Mount Vernon Street, unexposed to the temptations of Europe, could they have relied on the moral influences of Boston itself. Although the parents little knew what took place under their eyes, even the mothers saw enough to make them uneasy. Perhaps their dread of vice, haunting past and present, worried them less than their dread of daughters-in-law or sons-in-law who might not fit into the somewhat narrow quarters of home. On all sides were risks. Every year some young person alarmed the parental heart even in Boston, and although the temptations of Europe were irresistible, removal from the temptations of Boston might be imperative. The boy Henry wanted to go to Europe; he seemed well behaved, when any one was looking at him; he observed conventions, when he could not escape them; he was never quarrelsome, towards a superior; his morals were apparently good, and his moral principles, if he had any, were not known to be bad. Above all, he was timid and showed a certain sense of self-respect, when in public view. What he was at heart, no one could say; least of all himself; but he was probably human, and no worse than some others. Therefore, when he presented to an exceedingly indulgent father and mother his request to begin at a German university the study of the Civil Law--although neither he nor they knew what the Civil Law was, or any reason for his studying it--the parents dutifully consented, and walked with him down to the railway-station at Quincy to bid him good-bye, with a smile which he almost thought a tear.