Note 181 — II FORMS OF RINGS AND MATERIALS OF WHICH THEY ARE MADE

A natural or artificial mixture of gold and silver found native at Vorospotak, Transylvania, and elsewhere, mentioned by Herodotus. The electros, ἧλεκτρος, of Homer and Strabo; Pliny, xxxiii, 23; although this word was most frequently used to designate amber. Varying in specific gravity from 15.5 to 12.5. The ratio of gold to silver is 1:1. Specific gravity of gold, 19.33; silver, pure, 10.5; correspond to 35.3 per cent. of silver, gold 64.7 per cent. Pliny states that when the proportion of silver to gold is 1:4 (20 per cent.), it is called electra.