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44 13 Diagram to explain Eclipses. 14 Illustration of the Tides. 15 Telescopic View of Mars. 16 Telescopic View of Jupiter. 17 Telescopic View of Saturn. 18 Comet of 1811. 19 Comparative Size of the Sun and Planets. 20 Star Cluster of Resolvable Neb- ulae. PER SLIDE, $2.00. 21 Bird's-eye View of Saturn and its ring system. 22 Saturn, luminous points visible near the period of the disap- pearance of the rings. 23 Telescopic View of Saturn. 24 Comparative size of Saturn and the Earth. 25 Telescopic View of the Moon, a little before last quarter. 26 Telescopic View of the Moon, just before the full. 27 Scenery on the Moon. 28 Mountains of the Moon ; view of the region southeast of Tycho. 29 Comparative size /of Sun, the Earth and Moon^s Orbit. 30 Eclipses and passages of the Satellites of Jupiter, seen from the Earth. 31 Parallax. 32 Direct and retrograde motion of Mercury and Venus. 33 The apparent size of the Sun seen from the principal Planet. 34 Egyptian Zodiac. 35 The Micrometer. 36 Discovery of a small Planet by means of Ecliptic Charts. 37 Ecliptic Chart. From M. Cha- cornac's " Star Atlas." 38 Herschel's 40 feet Telescope. 39 Measure of the distance of an inaccessible object. 40 Deformation of the Sun's limb at sunset. 41 Convexity of the Ocean. 42 Solar Cyclone, May 5, 1857. (Secchi.) 43 Donati's Comet. 44 Spiral Nebulae in Virgo. (Rosso.) 45 Nebulae in Andromeda. 46 Elliptical annular nebula of the Lion. (Herschel.) 47 Spiral Nebulae in Canes Venatici. (Rosse.) 48 Lunar Crater. Class XXIX—Geology. TWENTY SLIDES, PER SET, $30.00. 1 The Geological Record. 2 Ideal Section of the Earth's Crust. 3 Thickness of the Earth's Crust. 4 Section of a Volcano in action. 5 Fingal's Cave. 6 Grotto of Antiparos. 7 Glacier—Mt. Rose. 8 Glacier Tables. 9 Coral Island. 10 Corals. 11 Rain Drop Marks. 12 Trilobites. 13 Ammonites. 14 Pterichthys—Cocostes, Cephalas- pis. 15 Fossil Fern—impression of. 16 A Thrust—in a Coal Mine. 17 Ichthyosaurus. 18 Pterodactyl. 19 Fossil Footmarks. 20 The Mammoth Restored. PER SLIDE, $2.00. 21 Skeleton of Megatherium. 22 Sigillaria. 23 Lepidodendron. 24 Tracks (the Stone Books). 25 Bone Cavern, Wirksworth, Eng. 26 Skeleton of HydrarchosIIurlanii. 27 Pentacrinites Briareus. 28 Apiocrinites and Actinocrinites. 29 Forest of the Coal Period. 30 Dinornis Mantelii. 31 Foraminifera (from Atlantie soundings). 32 Lava Arch, Iceland.