I have received numerous communications from sources in California, entitled to high regard, in reference to the proposed Pacific Railroad. As it would be impossible for me to answer them all, I deem it most proper and respectful to address you a general answer in your official capacity. In performing this duty to the citizens of California, I act in perfect consistency with the self-imposed restriction contained in my letter accepting the nomination for the Presidency, not to answer interrogatories raising new and different issues from those presented by the Cincinnati convention, because that convention has itself adopted a resolution in favor of this great work. I, then, desire to state briefly that, concurring with the convention, I am decidedly favorable to the construction of the Pacific Railroad; and I derive the authority to do this from the constitutional power “to declare war,” and the constitutional duty “to repel invasions.” In my judgment, Congress possess the same power to make appropriations for the construction of this road, strictly for the purpose of national defence, that they have to erect fortifications at the mouth of the harbor of San Francisco. Indeed, the necessity, with a view to repel foreign invasion from California, is as great in the one case as in the other. Neither will there be danger from the precedent, for it is almost impossible to conceive that any case attended by such extraordinary and unprecedented circumstances can ever again occur in our history. Yours very respectfully, JAMES BUCHANAN. To B. F. WASHINGTON, Esq., Chairman of the Democratic State Central Committee of California. [TO JOSHUA BATES, ESQ., LONDON.] WHEATLAND, near LANCASTER, Nov. 6, 1856. MR DEAR SIR:— I received in due time your kind congratulatory letter of the 10th July, which I should have immediately answered had I been able to express a decided opinion as to the result of the Presidential election. It was one of the most severe political struggles through which we have ever passed. The preachers and fanatics of New England had excited the people to such a degree on the slavery questions, that they generally prayed and preached against me from their pulpits on Sunday last, throughout that land of “isms.” Your information from Massachusetts was entirely unfounded—Boston is a sad place. In that city they have re-elected to Congress a factious fanatic, ...... who, in a public speech, said that we must have an anti-slavery Constitution, an anti-slavery Bible, and an anti-slavery God.