[ I. THE BRITISH MUSEUM ] [ II. THE ROYAL SOCIETY OF LONDON FOR IMPROVING NATURAL KNOWLEDGE ] [ III. THE ROYAL INSTITUTION AND THE LOW-TEMPERATURE RESEARCHES ] [ IV. SOME PHYSICAL LABORATORIES AND PHYSICAL PROBLEMS ] [ V. THE MARINE BIOLOGICAL LABORATORY AT NAPLES ] [ VI. ERNST HAECKEL AND THE NEW ZOOLOGY ] [ VII. SOME MEDICAL LABORATORIES AND MEDICAL PROBLEMS ] [ VII. SOME UNSOLVED SCIENTIFIC PROBLEMS ] [ IX. RETROSPECT AND PROSPECT ]