There is one large group of evidence, embracing most of the phenomena which have been under consideration, from which I had hoped to make copious selections, with pleasure to myself, and with interest to the reader. No living scientist has bestowed so large an amount of study on "certain phenomena usually termed spiritualistic" as Sir William Crookes. As long ago as the year 1874, Sir William Crookes gave permission for the reprint of a limited number of copies of various articles which he had contributed to the periodical literature of the day. These, with some other original matter, were published under the title of "Researches in the Phenomena of Spiritualism." That volume has long been out of print. In 1890, an article by Sir William Crookes, under the title of "Notes of Seances with D. D. Home," was published in volume vi. of the _Proceedings_ of the Society for Psychical Research. He also referred to his experiences with D. D. Home, in two addresses delivered at meetings of the Society in 1894 and in 1899. These are reported in the _Journal_ of the Society. Sir William Crookes also devoted a portion of his address, as President of the British Association in 1898, to a reference to the part he took many years before in psychical research. This portion of the address was reprinted in volume xiv. of the _Proceedings_ of the Society. Considerations, which cannot be entered into here, compel me, however, to be content with referring the reader to the publications mentioned, a study of which will, I think, bring conviction that the scientific evidence they contain would, even if it stood alone, be amply sufficient to prove the reality of the alleged phenomena.[67] * * * * * We are now warranted in the assertion that we have arrived at this position: That the careful reader is compelled to admit that the evidence in favour of a variety of alleged physical phenomena being undoubted facts, is too strong to be resisted. We are accustomed to say in ordinary life, the proof of this or that is complete. The man of science is accustomed to say in his own sphere of inquiry, the proof of this or that is complete. Applying the same rules of evidence to physical phenomena generally called spiritualistic, we are bound to admit that in regard to many of them the proof of their reality is complete. Yet these facts are not recognised by the world of science, and are scarcely deemed worthy of any serious attention by the majority of intelligent people.