His last active effort was the delivery of three lectures at Berlin in the spring of 1905. He has always avoided public lectures as much as possible. His poor voice and comparative nervousness make the work unattractive. A severe attack of influenza sapped his strength in the winter of 1905, and he has been unable to eliminate its unpleasant consequences. But the opportunity of enforcing his gospel in the capital of the Empire, where the Virchows and Du Bois-Reymonds had ruled so long made him deaf to the counsels of prudence. He chose as his theme the controversy in regard to evolution, and gave three spirited lectures. The changed world came home to him vividly enough. A vast and enthusiastic gathering of admirers in one of the finest halls in Berlin: outside, at the very door, his clerical opponents distributing handbills that offered a choice selection of the most venemous attacks on his person and work. The lectures are now available in English under the title of _Last Words on Evolution_. The present state of Haeckel’s health forbids him to hope that he will do any more active work. As I write, he lies in his villa, in “Haeckel Street,” overlooking the handsome Zoological Institute, which he raised, and the little university town that he has made known to the world. Beyond the graceful hills that cradle it, he sees the dark waves tossing that he has worked so hard to set in motion. In Germany the alliance of the Emperor with the Catholics saddens him, but—the Jesuits are accepting evolution, over the fresh grave of Virchow. Abroad his ideals, even his ideas, are making triumphant progress. He thinks of the vast changes that have taken place since he stood out, almost alone, reckless of all but honour and truth, at the Stettin Congress in 1863. “Das Leben ist schön,” he still repeats. What will men say of _him_ when the lines of history draw in, and the critic will have the proper perspective? I believe no great worker ever thought less about it. Through inexorable labour, through constant sacrifice, through storms of painful obloquy, he has lived his ideals, if he has made mistakes—been mortal. Those ideals are an enduring contribution to the good. The first, the motto of his young days, was _Impavidi progrediamur_—“Let us march on fearlessly.” The second, the motto of his later years, was: “The good, the true, and the beautiful, are the ideals, yea the gods, of our Monistic philosophy.” ------------------------------------------------------------------------ Bibliography The following is a list of the works by Professor Haeckel that have been translated into English:— “The History of Creation.” Translation (in two vols., edited by E. Ray-Lankester) of the _Natürliche Schöpfungsgeschichte_. 1876. [4th edition, 1892.] “Freedom in Science and Teaching.” Translation (with preface by T. H. Huxley) of the _Freie Wissenschaft und Freie Lehre_. 1879.