Gas (Illuminating) - Made by Dr. Clayton about A. D. 1735.

Gas Meter - Invented by Mr. Clegg, a. d. 1815.

Geography - Known first as a study to the Romans.

Geometry - Origin ascribed to the Egyptians.

Glass - Discovered by the Phoenicians.

Glycerine - Discovered by Scheele, a. d. 17S9.

Gold - A metal known as old as history.

Guillotine - Invented by J. I. Guillotin of Paris.

Gun Cotton - Discovered by Professor Schonbein of Basel, Switzerland, a. d. 1846.

Gunpowder - Known to some Hindoo tribes, B. C. 355.

Harmonium - Invented by Grenie, A. d. 1810.

Hats - First made by a Swiss at Paris, a. d. 1404.

Heliometer - Invented by Bouguer, a. d. 1747.

Hydraulic Ram - Invented by Montgolfier in the 18th century.

Hydraulic Press - Invented by Pascal; constructed by Joseph Bramak, A. d. 1796.

Hydrogen - Discovered in the 16th century by Paracelsus.

Indium - A metal discovered by Reich and Ritcher of Frieberg, Saxony, a. d. 1863.

Iridium - Discovered by Descotils, A. D. 1803.

Iron - A metal known to the ancients.

Lanthanium - A metal discovered by Mosander, a. d. 1841.

Lead - A metal known to the ancients.

Lightning Rods - Invented by B. Franklin, 1752.

Lithium - A metal first obtained by Day, a. d. 1818.

Locomotive - Invented by Watt, 1759.

Lyre - The earliest known of all stringed instruments.

Magic Lantern - Invented by Athanasius Kircher.

Magnesium - The metal first obtained by Bussy, a. d. 1830.

Magnet - The properties of the loadstone were discovered by the Greeks.

Manganese - First isolated by Gahn, a. d. 1774.

Mariner's Compass - Invention claimed by the Chinese for the Emperor Hong-ti, a grandson of Noah, about 2634 b. c.

Matches, Lucifer - Invented by Godfrey Hanckurtz, a. d. 1680.

Melodeon - Invented by Jeremiah Carhart, A. d. 1836.

Mercury - Known from the earliest ages.

Microscope - It was invented by Tansen, a. d. 1590.

Mirrors - Invented by the Venetians with a coating of tinfoil and mercury on the glass in the 16th century.

Mower and Reaper - Suggested by the ancients.

Musket - The first portable firearm, called the bombard, A.D. 1468.

The Arquebuse came into use about a. d. 1480.

The Musket was used a. d. 1521.

The Wheel Lock was invented at Nuremberg about A. D. 1517.

The Flint Lock came into use about a. d. 1692.

Percussion Caps came into general use between 1820 and 1830.

Nails - First machine for cutting nails was invented in New York, A. d. 1794.

Nickel - A metal discovered by Cronstedt, a. d. 1751.

Nitric Acid - First obtained by Raymond Sully, a. d. 1287.

Nitrogen - Discovered by Rutherford, a. d. 1772.

Observatories - The Tower of Babel, erected 2247 B. c.

Omnibus - First appeared in Paris, a. d. 1825.

Oratorio - origan ascribed to St. Philip Neri, a. d. 1550.

Organs - Invention ascribed to Archimedes about 220 b. c.

Osmiuno - A metal discovered by Tennant, A. D. 1803.

Oxygen - Discovered by Priestley in England, A. D. 1774.

Padlock - Invented by Bechar at Nuremberg, a. d. 1540.

Palladium - A metal discovered by Wollasten, a. d. 1803.

Paper - From fibrous matter by the Chinese, a. d. 95; first made from cotton, a. d. 1000; first paper made from rags, A. D. 1319.

Pens - From quills, used about a. d. 553; steel pens were first made by Mr Wise of England, a. d. 1803.

Phonograph - Invented by T. A. Edison, a. d. 1878.

Phonography - Invented by Isaac Pitman of England, a. d. 1837.

Photographing Objects in Motion - Invented by E. J. Muybridge of San Francisco, Cal., a. d. 1879.

Phosphorus - Discovered by Brandt of Hamburg, a. d. 1669.

Photography - First known in the 16th century; the Daguerreotype process discovered by M. Daguerre, a. d. 1839; producing negative photographs, invented by H. F. Tabbot, a. D. 1839; collodion was used by F. Archer, a. d. 1851.

Piano Forte - Invented by Cristofali, a. d. 1711.

Pistols - Known before the middle of the 16th century.

Platinum - Discovered by Don Antonio Ulloa, a. d. 1735.

Potassium - Obtained in a metallic state by Sir Humphrey Davy,

A. D. 1807.

Printing - Was practiced by the Chinese 50 b. c. Printing Press - The inventor of the hand press is unknown; cylinder press invented by Mr. Nicholson, a. d. 1790.

Prussic Acid - Discovered by Dissbach (German), a. d. 1709. Pump - Invention of valve pump by Ctesibius of Alexandria, 224

B. c.

Quinine - Discovered by Pellitier and Caventou, a. d. 1820. Rifle - Invented in the loth century by Gaspard Zollner. Rubidium - A metal discovered by Bunsen and Kirchoff, a. d. 1860. Ruthenium - A metal observed by Professor Osman in the Ural Mountains.

Saddles - Were used first in the 13th century.

Safety Lamp - Invented by Sir Humphrey Davy, A. D. 1815.

Saw- -According to Pliny, invented by Daedalus.

Screw - Known to the Greek.

Sewing Machine - Invented by Elias Howe, Jr., A. D. 1846.

Silver - Known to the ancients.

Soap - An invention of the Gauls.

Sodium - A metal first obtained by Sir Humphrey Davy, a. d. 1807.

Spectacles - Invented by Alexander de Spina, A. D. 1285.

Spinning Wheel - Invented 1330.

Spinning Jenny - Invented by Hargreaves, A. D. 1767.

Steamboat - Invented by Robert Fulton, 1807.

Steam Engine - James Watt invented the first perfect steam engine in England, a. d. 1764.

Steam Hammer - Invented by James Nasmyth, a. d. 1838.

Steel - Has been fabricated from the earliest times.

Steel Manufacture, Purification of Iron - Invented by H. Bessemer, 1856. Stereoscope - Was known to Euclid, 300 B. C.. Stereotype - Invented by M. M. Didot in the 18th century. Stethoscope - Invented by M. Laennec of Paris, a. d. 1823. Strontium - A metal first obtained by Sir Humphrey Davy, a. D. 1808. Swords - Were formed of iron by the Chinese, 1879 b. c. Telegraph - Invented by Professor S. F. B. Morse, a. d, 1837.

Telescope - Was invented by Lifferbein in 1608. The first reflecting one was made by Isaac Newton, a. d. 1668.

Tellurium - A metal discovered by Kloproth, a. d. 1798.

Telephone - Invented by A. G. Bell, a. d. 1876.

Thallium - A metal discovered by Crookes, A. D. 1861.

Theatres - The first erected, the Bacchus at Athens, Greece, by Philos, 420 b. c.

Thermometer - The invention is generally credited to Galileo, a. d. 1596.

Threshing Machine - Invented by Michael Menizies at Edinburgh, a. d. 1732.

Thorium - A metal discovered by Berzelius, a. d. 1828.

Tinanium - A metal discovered by Gregoi in Cornwall, England, a. d. 1789.

Tin - Was known to the ancients.

Tobacco - Was discovered in San Domingo in 1496.

Torpedo - Invented by David Bushnell, 1777.

Trigonometry - Invented by the Greek astronomers at AlexandriaVaccination - Proposed by Dr. Edward Jenner, a. d. 1796.

Vanadium - A metal discovered by Sefstrom, a. d. 1830.

Velocipede - Invented by M. Drais, a. d. 1S17.

Violin - Believed to have been invented by Ravana, King of Ceylon, 500 B. c.

Watch - Said to have been made first at Nuremberg, a. d. 1477.

Wire - The invention of drawing wire invented by Rodolph of Nuremberg, a. d. 1410.

Zinc - The ore from which the metal is made was by the Greeks.

Zirconium - A metal first obtained by Berzelius, a. d. 1824.