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Element. Atomic weight. Specific refraction. Atomic refraction. Hydrogen.................. 1-008 1-488 1-5 Lithium...................... 7-0 0-514 3-6 Beryllium.................. 9-0 0-733 6-6 Boron.......................... 11 -o 0 '436 or 0 '317 4 -8 or 3 -5 Carbon..................... 12 -0 0-383 4-6 Nitrogen................... 14-03 0 -343, &c. 4 "8, &c. Oxygen...................... Fluorine'.................... 16 -0 0-203 or 0-169 3 -25 or 2 *7 19-0 0-031 0-6? Argon.......................... Sodium............. ......... 19-94 0 159 3-17 23 -05 0 -202 4-65 Magnesium................ 24-3 0-287 6-9 Aluminium ......... 27-0 0 -352 9-5 Silicon....................... 28-4 0-250 or 0-204 7 -1 or 5 -8 Phosphorus................ 31 -0 0 -594 18*4, &c. Sulphur...................... 32 -0 0-422 or 0-500, &c. 13 "5 or 16 "0, &e. Chlorine..................... 35-45 0-282 or 0-302 10-0 or 10-7 Potassium.................. 39-11 0 -205 8-0 Calcium...................... 40-0 0-252 10-1 Titanium.............. 48 -0 0-522 25-0 Vanadium.................. 51 -4 0-481 24-7? Chrom ium ................ 52-1 0-296 15-4 Manganese................. 55 -0 0-208 11 -5 Iron ................ .. 56 -0 0-209 or 0-355 11-7 or 19-9 N ickel....................... 58 -7 0-186 11-0 C obalt....... . .......... 59-5 0-183 10-9 Copper................... 63-6 0 -184 11-7 Zinc........................... 65-3 0-151 9-9 <J allium..................... 69 -0 0-214 14 -76 Arsenic..................... 75 -0 0-200 15 -0 Selenium ................. 79 -0 0 -339, &c. 26 -8, &c. Bromine................... 79 -95 0-190 or 0-213 15-2 or 17-0 Rubidium................. 85-5 0-133 11-4 Strontium............. 87-66 0-152 13-3 Yttrium ..................... 89-1 0-197 17-6 Zirconium ................. 90-6 0-242 21 -9 Rhodium................... 103-0 0-232 23 -9? Palladium 106-5 0-213 22-7 Silver......................... 107 -92 0 121 13-1 Cadmium............... «. 112-0 0T24 13 -9 Indium ..................... 113 7 0 153 17'4 Tin............................. 119 -0 0-232 or 0-161 27-6 or 19-2 Antimony................. 120 -0 0 -204 or 0 -200 24-5 or 24-0 Iodine....................... 126 -85 0-192 or 0-214 24*4 or 27•2 Caesium..................... 132-9 0-117 15-6 Barium..................... 137 -43 0-117 16-1 Lanthanum............... 138 -2 0-143 19 -8 Cerium....................... 140-2 0-143 20-0? Iridium..................... 193-1 0-165 31-9? Platinum................... 195 0 0-172 33 -5 Gold........................... 197 -3 0-127 25-1 Mercury ................... 200-0 0-107 or 0-099 21-5 or 19-8? Thallium.................. . 204 -0 0 -106 21 -6 26 -7 ? or 24 5 32 -0? 28-7 L ead ............. .......... 206 95 0-129 or 0-119 Bismuth..................... 208*0 0 -154 Thorium................. .. 232 -6 0-123
