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By Henry E Roscoe; Carl Schorlemmer; John Cannell Cain; Charles Henry Jeens; Bernard Mouat Jones

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139-0 . 206-4 . 7-01 . 23-94 . 54-8 . 199-8 Molybdenum . Nickel . Niobium Nitrogen Osmium. Oxygen . Palladium . Phosphorus. Platinum . Potassium . Rhodium . Rubidium . Ruthenium . Selenium . Silver . Silicon . Sodium . Strontium . Sulphur . Tantalum . Tellurium . Terbium. Thallium Thorium. Tin . . Titanium Tungsten . Uranium . Vanadium . Yttrium . Zine . . Zirconium . Atomic weight. . 95-8 . 58-6 . 94-0 . 1401 . 198-6 . 15-96 . 1062 . 30-96 . 196-7 . 39-04 . 1041 . 85-2 .

For the purpose of exhibiting this we only need to pass a curreut of electricity from four or six Grove's or Bhnsen's elements by means of two platinum poles through some water acidulated with sulphuric avid (Fig. 5). The instant contact is made, bubbles of gas begin to ascend from each platinum plate and collect in the graduated tubes, which at first are filled with the acidulated water. After a little time it will be seen that the plate which is in coa- Fu. 5 neetion with the zinc of the battery evolves more gas than the one which is in contact with the platinum or carbon of the battery; and after the evolution has continued for a few minutes one tube will be seen to contain twice as much gas as the other.

Y. 260, 1871-5. 3—2 36 HISTORICAL INTRODUCTION. " Thomson states that during the years 1803 and 1804 Dalton was occupied with the examination of the composition of the two gaseous hydro-carbons, marsh gas and defiant gas, and the results of this examination led him to, the adoption of the atomic theory. He found that both these bodies consist solely of carbon and hydrogen, and that the first of these gases contains twice as much hydrogen to a given quantity of carbon as the second. Hence he concluded that defiant gas contains one atom of carbon combined with one of hydrogen, whereas marsh gas consists of one atom of csrbon combined with two atoms of hydrogen.

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A treatise on chemistry by Henry E Roscoe; Carl Schorlemmer; John Cannell Cain; Charles Henry Jeens; Bernard Mouat Jones

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