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Chemical Elements in order of their Discovery.

ELEMENT. DATE. DISCOVERER. ELEMENT. DATE. DISCOVERER. Gold,

1

Sodium, 1807 Davy. Silver,

Potassium, 1807 Davy. Copper,

Calcium,

1808 Davy. Iron,

Barium,

1808 " Davy. Tin,

Ancients. Strontium, 1808 Davy. Lead,

Boron,

1808 Davy. Mercury,

Iodine,

1811 Courtois. Sulphur,

Lithium, 1817 Arfvedson. Carbon,

Selenium, 1817 Berzelius. Antimony, (?) 1450 Basil ValentineCadmium, 1818 Stromeyer. Bismuth, (?) 1450 Basil Valentine Silicon, 1823 Berzelius. Zinc, (?) 1520

Paracelsus. Zirconium, 1824 Berzelius. Phosphorus, 1669 Brand. Bromine, 1826 Balard. Arsenic, 1694 Schroeder. Glucinum, 1828 Wöhler. Cobalt, 1733

Brandt. Yttrium, 1828 Wöhler. Platinum, 1741 Wood.

Thorium, 1828 Berzelius. Nickel,

1751

Cronstedt. Aluminium, 1828 Wöhler. Hdrogen, 1766 Cavendish. Magnesium, 1829 Bussy. Fluorine,

1771 Scheele. Vanadium, 1830 Sefstrom. Nitrogen, 1772

Rutherford. Lanthanum, 1839 Mosander. Oxygen,

1774 Priestley.

Priestley. Didymium, 1841 Mosander. Manganese, 1774 Gahn. Erbium,

1843 Mosander. Chlorine, 1774 Scheele. Ruthenium,

1845 Claus. Tungsten, 1781 d' Elhujar. Caesium, 1860 Bunsen. Tellurium, 1782 Reichenstein Rubidium, 1860 Bunsen. Molybdenum, 1782 Hjelm. Thallium, 1862 Crookes. Uranium, 1789 Klaproth. .

Indium,

Reich and Titanium, 1791 Gregor. Chromium, 1797 Vauquelin. Gallium,

Lecoq de Columbium, 1801 Hatchett.

1875 Boisbaudran. Tantalum, 1802 Ekeberg Ytterbium, 1878 Marignac. Cerium. 1803 Berzelius.

Berzelius. Scandium, 1879 Nilson. Iridium,

1803 Tennant. Osmium,

Samarium, 1879
1803 Tennant.
Rhodium, 1804 Wollaston. Germanium, 1886 Winkler.
Palladium,

1804 Wollaston. Besides the above there is a number of substances which have been announced as elements, but the true nature of them is still under investigation. These include : Name. Date. Discoverer. Name.

Date. Discoverer. Thulium, 1879, Cleve.

Praseodymium, 1885, Welsbach. Holmium, 1879, Cleve. Dysprosium, 1886,

Lecoq de Neodymium, 1885, Welsbach,

BoisbaudranThere are more than thirty others, not named as yet, but temporarily denoted by letters. H. CARRINGTON BOLTON, New York City.

1863 Richter.

{ Boisbaudran.

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