Francis. See vol. ii., p. 192.

Novum Organum was published in London, 1620. The Letters and Life of
Lard Bacon, in 7 vols., by James Spedding, appeared in 1862-1874. Bacon,
Roger. See vol. ii., p. 44.

Only an approximate estimate of the number of Bacon's works can be given
even now, although an infinite amount of time and labor has been
spent in collecting them. His great work is the Opus ma jus, "the
Encyclopaedia and the Organum of the Thirteenth Century." A partial list
of some of his other works is the following: Speculum alchemio, 1541
(trans, into English); De mirabili potestate artis et naturo, 1542
(trans, into English, 1659); Libellus de retardants se-nectutis
accidentibus, 1590 (trans, as "The Cure of Old. Age," 1683); and
Sanioris medicino Magistri d. Rogeri Baconis Anglici de arte chymio
scripta, 1603. 248

Boyle, Robert. See vol. ii., p. 205.

Philosophical Works, 3 vols., London, 1738.

Copernicus, Nicolaus. See vol. ii., p. 54.

Ad clar. v. d. Schonerum de libris revolutionism eruditiss. viri et
mathemattci excellentiss. Rev. Doctoris Nicolai Copernici Torunnaei,
Canonici Warmiensis, per quemdam juvenem mathematico studio sum,
Narratio prima, Dantzic, 1540. This was the first published statement
of the doctrine of Copernicus, and was a letter published by Rheticus.
Three years afterwards Copernicus's De orbium colestium revolutionibus,
Libri VI., was published at Nuremberg (1543).

Descartes, Rene. See vol. ii., p. 193.

Traite de Vhomme (Cousins's edition, in 11 vols., Paris, 1824).

Galilei, Galileo. See vol. ii., p. 91.

Dialogo dei due massimi sistemi del mondo, Florence, 1632. Discorsi e
dimostrazioni matematiche intorno a due nuove scienze, Leyden, 1638.
Gilbert, William (1540-1603). See vol. ii., p. 113.

De magnete, magneticisque corporibus, et de magno magnete tellure,
London, 1600. De magnete was trans. by P. Fleury Motteley, London, 1893.
Guericke, Otto von (1620-1686). See vol. ii., p. 213.

Experimenta nova, ut vocant, Magdeburgica de vacuo spatio, Amsterdam,
1672. In the Phil. Trans, of the Royal Society of London, No. 88, for
1672.

Hales, Stephen (1677-1761). See vol. ii., p. 298.

Statical Essays, comprising Vegetable Staticks, London, 1727, and
Homostatics, London, 1733. Harvey, William. See vol. ii., p. 169.

Exercitatio anatomica de motu cordis et sanguinis, Frankfort-on-Main,
1628. The Works of, trans, by Robert Willis, London, 1847. Hauksbeb,
Francis. See vol. ii