Suppose Dr. Fuller should become insane, or otherwise unfit to manage his own affairs. Such cases often occur. Then the control of the slaves would pass with his other property into other hands. What would insure their continued mental and moral well-being? The law would not,--public opinion would not! Every thing would depend on the character of the legal guardian or trustee; and even this could afford no adequate protection. The law permits an _owner_ to do many things which it would not suffer a guardian or a trustee to do. The legal guardian of Dr. Fuller's estate would hardly be allowed to suffer his slaves to "perform _not one half_ the work done by free laborers." The guardian's rule of conduct would be the _law_, and the _common_ mode of treatment in the community. If he overstepped this line, and any pecuniary loss should be the consequence, the loss would fall on him personally. How many guardians or trustees would be willing to run any risk of a criminal prosecution or a fine or imprisonment, in order to insure the happy condition of anther's man property? Not one in ten thousand! And yet, unless his guardian was willing to do this,--unless he was willing to brave the law, and act contrary to the general customs of society, Dr. Fuller's slaves would very soon lapse into the same degraded condition in which the slaves about them commonly live. Nothing would be more likely than to find Dr. Fuller's guardian advertising in the following manner:-- "NEGROES TO HIRE.--On Wednesday, the 26th inst. I will hire to the highest bidder the negroes belonging to Charles and Robert Innes. GEO. W. WILLIAMS, Guardian." "NEGRO HIRINGS.--Will be offered for hire, at Capt. Long's Hotel, a number of slaves, men, women, boys, and girls, belonging to the orphans of George Ash, deceased. RICHARD W. BARTON, Guardian." The law forbids teaching slaves to read and write. Dr. Fuller may disregard the law, and give his slaves careful instruction, supplying them with plenty of books, and allowing them time to read in. The law denies marriage to the slaves, and pays no heed to their family ties. Dr. Fuller may consecrate with the utmost care the marriage of his slaves, and sacredly protect their family relations. The law declares slaves to be, under all circumstances, saleable articles. Dr. Fuller may think that he treats them as men, and shudder at the thought of selling them. Thus may he do in his lifetime; but it is appointed unto all men to die; and what, in the event of his death, will become of his slaves?