——­ doctrine of transmutation, 47, 74, 123, 170.

——­ language, 36, 96, 101, 102.

——­ quest of the One Thing, modern form of, 179.

——­ signs, 105.

——­ theory, general sketch of, 26.

Alchemists, character of, according to Paracelsus, 25.

——­ made many discoveries, 87.

——­ sketches of lives of some, 115.

——­ their use of fanciful analogies, 31.

Alchemy, beginnings of, 23.

——­ change of, to chemistry, 126.

——­ contrasted with chemistry, 202.

——­ general remarks on, 123.

——­ lent itself to imposture, 106.

——­ object of, 9, 26, 32, 105.

——­ probable origin of word, 25.

——­ quotations to illustrate aims and methods of, 11-14.

Alembic, 92.

Apparatus and operations of alchemists, 90.

Art, the sacred, 122.

Atom, meaning given to word by Dalton, 173.

Atomic theory of Greeks, 16.

——­ additions made to, by Dalton, 21.

——­ as described by Lucretius, 19.

Atomic weight, 174.

Atoms and electrons, 190, 198.

Bacon’s remarks on alchemy, 95.

Balsamo, Joseph, 110.

Basil Valentine, his description of the three principles, 51.

——­ his description of the four elements, 49.

——­ some of his discoveries, 88.

Becquerel, his discovery of radiation of uranium, 181.

Body, soul, and spirit of things, alchemical doctrine of, 48.

Boyle, on calcination, 128.

——­ on combustion, 141.

——­ on elements, 161.

——­ on the “hermetick philosophers,” 95.

——­ on the language of the alchemists, 55.

——­ on the natural state of bodies, 43.

Cagliostro, 110.

Calcination, 129, 132, 135, 140, 142, 151, 155.

Chaucer’s Canon’s Yeoman’s Tale, 107.

Chemical conception of material changes, 177.

Chemistry, aim of, 9, 26, 160.

——­ change from alchemy to, 126.

——­ methods of, 10.

——­ probable origin of word, 24.

Classification, alchemical methods of, 59.

Colours, Lucretius’ explanation of differences between, 18.

Combustion, 141.

Compounds, chemical conception of, 171.

Conservation of mass, 164.

Curie, her discovery of radium, 182.

Dalton’s additions to the Greek atomic theory, 21, 172.

Democritus, his saying about atoms, 15.

Dephlogisticated air, 147.

Destruction, thought by alchemists to precede restoration, 65, 127.

Electrons, 187-189, 197, 198.

Elements, alchemical, contrasted with chemical, 165;
  radio-active substances contrasted with, 190-192.

——­ the alchemical, 49, 54, 60.

——­ the chemical, 61, 62, 161.