FOOTNOTES:
[140] Joh. Bernouilli, Opera Omnia, Lausannæ, 1744. tom. i. p. 192.
[141] Pantometria, 1591.
[142] Lettres de Descartes. Paris, 1657.
[143] Math. Coll. vol. ii.
[144] Phys. Lib. iv. c. 8.
[145] It has been recently proposed to determine the density of high-pressure steam by a process analogous to this.
[146] Venturi, vol. ii.
[147] Galileo also reasons in the same way on the equality of the solids standing on the cutting plane, but one is sufficient for our present purpose.
[148] Gli altissimi e ultimi termini.
[149] Le ultime reliquie e vestigie lasciate da grandezze eguali.
[150] Punctum fluere, et lineam esse fluxum puncti. Tract. Syllept. Romæ, 1633.
[151] "Treatise of the Nature of Bodies. London, 1665."
[152] This beautiful experiment is more easily tried by drawing the bow of a violin across the edge of glass strewed with fine dry sand. Those who wish to see more on the subject may consult Chladni's 'Acoustique.'