Fabre had not yet left Orange when Darwin engaged in a curious correspondence which lasted until the former had been nearly two years at Sérignan, and which showed how passionately interested the great theorist of evolution was in all the Frenchman's surprising observations. It seems that on his side Fabre took a singular interest in the discussion on account of the absolute sincerity, the obvious desire to arrive at the truth, and also the ardent interest in his own studies, of which Darwin's letters were full. He conceived a veritable affection for Darwin, and commenced to learn English, the better to understand him and to reply more precisely; and a discussion on such a subject between these two great minds, who were, apparently, adversaries, but who had conceived an infinite respect for one another, promised to be prodigiously interesting. Unhappily death was soon to put an end to it, and when the solitary of Down expired in 1882 the hermit of Sérignan saluted his great shade with real emotion. How many times have I heard him render homage to this illustrious memory! But the furrow was traced; thenceforth Fabre never ceased to multiply his pin-pricks in "the vast and luminous balloon of transformism (evolution), in order to empty it and expose it in all its inanity." (9/12.) By no means the least original feature of his work is this passionate and incisive argument, in which, with a remarkable power of dialectic, and at times in a tone of lively banter, he endeavoured to remove "this comfortable pillow from those who have not the courage to inquire into its fundamental nature." He attacked these "adventurous syntheses, these superb and supposedly philosophic deductions," all the more eagerly because he himself had an unshakable faith in the absolute certainty of his own discoveries, and because he asserted the reality of things only after he had observed and re-observed them to satiety. This is why he cared so little to engage in argument relating to his own works; he did not care for discussion; he was indifferent to the daily press; he avoided criticism and controversy, and never replied to the attacks which were made upon him; he rather took pains to surround himself with silence until the day when he felt that his researches were ripe and ready for publicity. He wrote to his dear friend Devillario, shortly after Darwin's death: "I have made a rule of never replying to the remarks, whether favourable or the reverse, which my writings may evoke. I go my own gait, indifferent whether the gallery applauds or hisses. To seek the truth is my only preoccupation. If some are dissatisfied with the result of my observations- -if their pet theories are damaged thereby--let them do the work themselves, to see whether the facts tell another story. My problem cannot be solved by polemics; patient study alone can throw a little light on the subject. (9/13.)