It may here be mentioned that the internationality of science has shown itself active also in the question of atomic weights. These numbers undergo incessantly small variations because of new work done for their determination. To avoid the uncertainty arising from this inevitable state of affairs, an international committee was formed by the co-operation of the leading chemical societies all over the world, and an international table of the most probable values is issued every year. The following table is that for 1910:-- _International Atomic Weights_, 1910. Atomic | Atomic Weights. | Weights. Name. Symbol. O = 16. | Name. Symbol. O = 16. | Aluminium Al 27.1 | Mercury Hg 200.0 Antimony Sb 120.2 | Molybdenum Mo 96.0 Argon Ar 39.9 | Neodymium Nd 144.3 Arsenic As 74.96 | Neon Ne 20.0 Barium Ba 137.37 | Nickel Ni 58.68 Beryllium Be \ 9.1 | Nitrogen N 14.01 (Glucinum) Gl / | Osmium Os 190.9 Bismuth Bi 208.0 | Oxygen O 16.00 Boron B 11.0 | Palladium Pd 106.7 Bromine Br 79.92 | Phosphorus P 31.0 Cadmium Cd 112.40 | Platinum Pt 195.0 Caesium Cs 132.81 | Potassium K 39.10 Calcium Ca 40.09 | Praseodymium Pr 140.6 Carbon C 12.00 | Radium Ra 226.4 Cerium Ce 140.25 | Rhodium Rh 102.9 Chlorine Cl 35.46 | Rubidium Rb 85.45 Chromium Cr 52.0 | Ruthenium Ru 101.7 Cobalt Co 58.97 | Samarium Sm 150.4 Columbium Cb \ 93.5 | Scandium Sc 44.1 (Niobium) (Nb) / | Selenium Se 79.2 Copper Cu 63.57 | Silicon Si 28.3 Dysprosium Dy 162.5 | Silver Ag 107.88 Erbium Er 167.4 | Sodium Na 23.00 Europium Eu 152.0 | Strontium Sr 87.62 Fluorine F 19.0 | Sulphur S 32.07 Gadolinium Gd 157.3 | Tantalum Ta 181.0 Gallium Ga 69.9 | Tellurium Te 127.5 Germanium Ge 72.5 | Terbium Th 159.2 Gold Au 197.2 | Thallium Tl 204.0 Helium He 4.0 | Thorium Th 232.42 Hydrogen H 1.008 | Thulium Tm 168.5 Indium In 114.8 | Tin Sn 119.0 Iodine I 126.92 | Titanium Ti 48.1 Iridium Ir 193.1 | Tungsten W 184.0 Iron Fe 55.85 | Uranium U 238.5 Krypton Kr 83.0 | Vanadium V 51.2