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having this in readiness for use at the proper time was, as we have seen, something that went back to his boyhood. He says of himself: "My mind is something like a piece of steel; it is very hard to scratch anything on it and almost impossible after you have got it there to rub it out."
Lincoln's correspondence has been preserved with what is probably substantial completeness. The letters written by him to friends, acquaintances, political correspondents, individual men of one kind or another, have been gathered together and have been brought into print not, as is most frequently the case, under the discretion or judgment of a friendly biographer, but by a great variety of more or less sympathetic people. It would seem as if but very few of Lincoln's letters could have been mislaid or destroyed. One can but be impressed, in reading these letters, with the absolute honesty of purpose and of statement that characterises them. There are very few men, particularly those whose active lives have been passed in a period of political struggle and civil war, whose correspondence could stand such a test. There never came to Lincoln requirement to say to his correspondent, "Burn this letter."
III
THE FIGHT AGAINST THE EXTENSION OF SLAVERY
In 1856, the Supreme Court, under the headship of Judge Taney, gave out the decision of the Dred Scott case. The purport of this decision was that a negro was not to be considered as a person but as a chattel; and that the taking of such negro chattel into free territory did not cancel or impair the property rights of the master. It appeared to the men of the North as if under this decision the entire country, including in addition to the national territories the independent States which had excluded slavery, was to be thrown open to the invasion of the institution. The Dred Scott decision, taken in connection with the repeal of the Missouri Compromise (and the two acts were doubtless a part of one thoroughly considered policy), foreshadowed as their logica