Asa Fitch
Early vacuum tube experiments
Experiment with gas molecules
Phosphorescence of ruby molecules
Phosphorescent qualities of gas molecues
Phosphorescence of potash molecules
Proving straight line of molecular travel
Testing polarities of molecular phosphorescence
Molecular phosphorescence and shadows
Molecular phosphorescence by shapes and polarity
Phosphorescence of shadows and polarity switch
Global seasonal wind chart based on the compass rose
Earth crust and interconnected ground waters
Heinrich Wilhelm Dove
Physical movement exerted by streaming molecules
Measuring recoil from molecular impact
Effect of magnet on molecular fluorescence
Molecular stream affected by magnet and varying input
Deflection of molecular stream and magnet polarity Public domain photograph of electrical equipment, power lines, engine, free to use, no copyright restrictions image - Picryl description
Molecular stream bypassing obstruction by magnet
Current carried in moluecular stream
Heat generated by focused molecular stream
Focal variation of molecular stream by magnet
Magnetic interference of focused molecular stream
Divergence and emergence in breeding
Wind chart of an oceanic quadrant
Old style mathematical calculation
Eratosthenes map of the world
Ptolemy map of the world
Outline of horse with extra digit on each foot Picryl description: Public domain artwork of horse, equestrian horse riding, free to use, no copyright restrictions image.
Evolution of horse hoof
Weather map western hemisphere 130° to 50° longitude.
World weather map jan 25 1878
Horizontal air movements around northern hemisphere cyclone
Vertical sections of the heart of a cyclone
Maneuvering ships on the exterior of a cyclone
Cirrus ans cirro-stratus clouds
Cyclone crossing from north america to europe
Chart of equal barometric pressures in and around north america
Position of clouds around a tropical cyclone
Suricate
Weather map eastern hemisphere 50° to 130° longitude
Chart of storm tracks of north pacific ocean
Benjamin Silliman, Jr. (December 4, 1816 – January 14, 1885)
Principal palms and Cycadeae of middle tertiary Europe
Primordial terrestrial plants
Proposed canal routes between the two oceans
Characteristic permian plants Public domain scan of print or book page depicting plant, botanical drawing, free to use, no copyright restrictions image - Picryl description
Homologous forms of paleocene and eocene oaks
Characteristic jurrassic plants Public domain scan of print or book page depicting plant, botanical drawing, free to use, no copyright restrictions image - Picryl description
Primordial marine plants Public domain scan of print or book page depicting plant, botanical drawing, free to use, no copyright restrictions image - Picryl description
Map of Hecataeus 500 BC
Successive forms of the laurel type
Map from the time of Hipparcus 100 BC.
Ideal view of the banks of Aix at the time of gypsum formation
Successive modifications of the type hedera
World of homer
Commercial shipping_routes of convenience to the proposed canal
A 19th-century edition of Ptolemy's c. AD 150 world map, using his second projection.
Claudius Ptolemy. Original caption: “From an Old Map.”
Arab map of the world 1009 AD
Map of the world 10th century
Mercator's first map 1538 AD. Public domain photograph of 16th-century plan, map, free to use, no copyright restrictions image - Picryl description
Italian itinerary Thirteenth century Public domain scan of a plan of settlement buildings, free to use, no copyright restrictions image - Picryl description
Observed celestial light phenomena
Edrisi map 1154 AD
Gerard Kremer Mercator
Ancient Greek concepts applied to melodic harmony
James concept of pure contiguous association
James concept of mixed association
Carl Ritter
Plan of dolmen chamber Public domain photograph of architecture design, diagram, drawing, building plan, free to use, no copyright restrictions image - Picryl description
Plan of dolmen chamber
General appearance of dolmens
James concept of similar association
Hydra vulgaris Public domain scan of drawing of insect, zoological illustration, free to use, no copyright restrictions image - Picryl description
Entrance to dolmen chamber
Fragment of Cordylophora lacustris Syn. Cordylophora caspia ITIS link: Cordylophora lacustris Allman, 1844 Invalid (mirror) ITIS link: Cordylophora caspia (Pallas, 1771) (mirror) World Register of Marine S More
James association of ideas
Appearance of chamber from the passageway
Arrangement of stones in dolmen chamber sidewall
Naked eyed medusae
Generative Buds or Gonophores of the Hydrozoa diagrammatically represented. a, simple gonophore; c, gonophore which has the structure of a Medusa (medusoid), but is not detached; d, free medusiform gonophore.
Longitudinal section of dolmen with chamber and passage
Portuguese man of war
Oceanic hydrozoa
Sea anemones
Diagrammatic figure of sea anemone
Somites of insect Public domain scan of drawing of insect, zoological illustration, free to use, no copyright restrictions image - Picryl description
Morphology of tape worm
Trematode worm