Haeckel, Professor Ernst. --his Gastraea theory, dependent on Huxley's discoveries. --Darwinism in Germany. --unable to attend British Association, 1866. --and Bathybius. --Letters to: --on reading "Die Radiolarien". --dissuades him from joining Arctic expedition: Darwinism: philological evidence in ethnology. --on his "Morphologie": controversy. --marriage: classification of birds: handwriting. --von Baer's Copley: reptiles and birds. --translation of his "Morphologie": influence of children. --notice of the "Anthropogenie": attack on Darwin in the "Quarterly": Amphioxus and the primitive vertebrate. --"Rattlesnake" "collection": his "Medusae" unpublished: Crayfish: Spirula: his children. Hahn, Father, reminiscences of Huxley's impartiality in teaching. Hamilton, on the unconditioned. Hand, lecture on. Harcourt, Sir W., letter to, suppression of physiological experiment. Hardwicke, printer. Harrison, F. --in Metaphysical Society. --attacks agnosticism. --controversy with: the "Apologetic Irenicon". --attack of, philosophically borne. Harrison, J. letter to: science and agriculture. Hartington, Lord. --science should be aided like the army and navy. --technical education. --letter to: Deceased Wife's Sister Bill. Hartismere, Lord, Vivisection Bill. Harvey. --lecture on. --article on. --tercentenary. Haughton, Professor S., leaves "Natural History Review". Hay, Sir John, visit to, at Tangier. Head, Francis, "javelins". Healy, T., and Parnell. Heathorn, Henrietta Anne (see Mrs. T.H. Huxley). --engagement. --description of. --remote prospect of marriage. --arrives in England. Heathorn, Mrs. Helmholtz. Helps, Sir A. Henslow, Professor. --death of. --relation to Darwin. Herring. --memoir on. --experiments as to the spawning of. --address on. Herschel, Sir John. Hesitation, no good ever done by. Hippocampus. Hird, Dr., presents testimonial to. Hirst, Thomas Archer. --and x Club --character of. --Royal Medal. --illness of. --death of. Histology, work on. Historical Society of Lancashire and Cheshire, presentation to Huxley. Hobhouse, Lord, Huxley secures intellectual freedom. Hockenhull, Swanus de, ancestor of the family of Huxley. Holiday, work. --borne well. --definition of. Holland, Sir Henry, on Plato. Home Rule, letter to A. Grey.