Aluminium 13.7 Antimony 12.9 Arsenic 75 Barium 68.5 Bismuth 21.3 Cadmium 56 Calcium 20 Cerium 47 Chromium 26.7 Cobalt 29.5 Copper 31.7 Didymium * Donarium * Erbium * Glucinium * Gold 197 Ilmenium * Iridium 99 Iron 28 Lanthanium * Lead 103.7 Lithium 6.5 Magnesium 12.2 Manganese 27.6 Mercury 100 Molybdenum 46 Nickel 29.6 Niobium * Norium * Osmium 99.6 Palladium 53.3 Pelopium * Platinum 98.7 Potassium 39.2 Rhodium 52.2 Ruthenium 52.2 Silicon 21.3 Silver 108.1 Sodium 23 Strontium 43.8 Tantalium 184 Tellurium 64.2 Terbinum * Thorium 59.6 Tin 59 Titanium 25 Tungsten 95 Uranium 60 Vanadium 68.6 Yttrium 32.2 Zinc 32.6 Zirconium 22.4 NON-METALLIC ELEMENTS. Boron 10.9 Bromine 80 Carbon 6 Chlorine 35 Fluorine 18.9 Hydrogen 1 Iodine 127.1 Nitrogen 14 Oxygen 8 Phosphorus 32 Sulphur 16 Selenium 39.5 By this list it will be perceived that the greatest number of the elements are metals, but most of these are very rare and met with but in certain localities, making up but a very insignificant part of the earth's surface, while others (never found in nature, as metals) in combination with oxygen forming "earths" compose the greater part of its bulk. But of all the elements, oxygen (a gas) is the most widely diffused, and constitutes rather more than one half of the whole earth, thus it forms 1/5th of the air, 9/10ths of the water, of the various earths and rocks about 1/2, and in all organised beings about 3/4. Of the metallic elements, those which form the greater bulk of the earth are-- Silicon. Aluminium. Calcium. Magnesium. Potassium. Sodium. These never exist in nature as metals, but combined with oxygen forming the following earths and alkalies:-- Silica } Alumina } EARTHS. Lime } Magnesia } Potassa } ALKALIES. Soda } These four "earths" form about eighty-five per cent. of the whole bulk of this globe, the remainder being made up of water (composed of eight parts oxygen and one part hydrogen), of "salt," both as rock or crystal-salt, and dissolved in the water of the sea, of the ores of different metals (metals in union with oxygen, sulphur, &c.), and of the remains of former vegetation, existing as coal.