First. Thought is a necessary natural product--the result of what is called impressions made through the medium of the senses upon the brain, not forgetting the Fact of heredity. Second. No human being is accountable to any being-human or divine--for his thoughts. Third. Human beings have a certain interest in the thoughts of each other, and one who undertakes to tell his thoughts should be honest. Fourth. All have an equal right to express their thoughts upon all subjects. Fifth. For one man to say to another, "I tolerate you," is an assumption of authority--not a disclaimer, but a waiver, of the right to persecute. Sixth. Each man has the same right to express to the whole world his ideas, that the rest of the world have to express their thoughts to him. Courtlandt Palmer, Esq., President of the Club, in introducing Mr. Ingersoll, among other things said: "The inspiration of the orator of the evening seems to be that of the great Victor Hugo, who uttered the august saying, 'There shall be no slavery of the mind.' "When I was in Paris, about a year ago, I visited the tomb of Victor Hugo. It was placed in a recess in the crypt of the Pantheon. Opposite it was the tomb of Jean Jacques Rousseau. Near by, in another recess, was the memorial statue of Voltaire; and I felt, as I looked at these three monuments, that had Colonel Ingersoll been born in France, and had he passed in his long life account, the acclaim of the liberal culture of France would have enlarged that trio into a quartette. "Colonel Ingersoll has appeared in several important debates in print, notably with Judge Jeremiah S. Black formerly Attorney-General of the United States: lately in the pages of The North American Review with the Rev. Dr. Henry M. Field, and last but not least the Right Hon. William E Gladstone, England's greatest citizen, has taken up the cudgel against him in behalf of his view of Orthodoxy To-night, I believe-for the first time, the colonel has consented to appear in a colloquial discussion. I have now the honor to introduce this distinguished orator." I admit, at the very threshold, that every human being thinks as he must; and the first proposition really is, whether man has the right to think. It will bear but little discussion, for the reason that no man can control his thought. If you think you can, what are you going to think to-morrow? What are you going to think next year? If you can absolutely control your thought, can you stop thinking?