318 LECTURE XXXIV. V 



computations have, however, been amply confirmed by the expt^Jmen^pl 4 

 Lambert* on the sounds of flutes. '" 



Dr. Chladni's method of examining the sounds of plates has afforded a 

 very interesting addition to our knowledge of the nature of vibrations ; his 

 discovery of the longitudinal sounds of solids is of considerable importance, 

 and he is said to be engaged in an extensive work on the subject of acustics 

 in general.t Some remarks which I have made in the Philosophical Trans- 

 actions may perhaps also be considered as tending to illustrate the vi- 

 brations of cords. The latest improvement which deserves to be mentioned, 

 with respect to the theory of sound, is Laplace's explanation of the increase 

 of its velocity on account of the effect of heat, which appears to afford a 

 satisfactory explanation of a difficulty so much the more important, as it 

 tended to lessen our confidence in every part of a theory, which differed so 

 widely from the most accurate and best established observations. 



1. 



LECT. XXXIV. ADDITIONAL AUTHORITIES. 



Musical Instruments. Sauveur on the Composition of Organ Pipes, Hist, et 

 Me*m. de Paris, 1702, p. 308, H. 90. Carre, ibid. 1702, H. 136. Weber, Poggen- 

 dorf's Annalen, xvi. xvii. 193. Savart, Mem. surla Construction des Instrumens a 

 Cordes, &c. Paris, 1819. 



Human Voice. Dodart, Hist, et Mem. 1700, p. 244, H. 17 ; 1706, pp. 136, 388 ; 

 1707, p. 66, H. 18. Ferrein, ibid. 1741, p. 409, H.51. Vicq d'Azyr, ibid. 1779, 

 p. 178, H. 5. Liscovius, Theorie der Stimme, Leipz. 1814. Savart, Annales de 

 Chimie, xxx. 64, &c. Biot, Precis Elementaire de Physique, 1824. Fechner's 

 German Trans, of do. Chladni, Gilbert's Ann. Ixxvi. 187. Mayer, Meckel's 

 Archiv, 1826. Willis on the Mechanism of the Human Larynx, Tr. Camb. Ph. Soc. 

 iv. 323. Bennati, Recherches sur la Mechanisme de la Voix Humaine, Paris, 1832. 

 Sir C. Bell, Ph. Tr. 1832. Muncke in Gehler's Physik Worterbuch, viii. 373. 

 Rush, The Philosophy of the Human Voice, Philadelphia, 1833. Malgaigne, Archiv. 

 Gen. de Med. 25. Lauth, Mem. de 1'Acad. Royale de Me"d. 1835. Lehfeldt, Dis. 

 de Vocis Formatione, Berol. 1835. Bishop, Ph. Mag. 1836. Mayer, Outlines of 

 Physiology, 1837. Miiller's Handbuch der Physiol. ii. 179, English translation, 

 1838, p. 1002. 



Voice of Birds. Duvernay, Hist, et Mem. ii. 4. Herissant, ibid. 1753, p. 279, 

 H. 107. Parsons, Ph. Tr. 1766, p. 204. Barrington, ibid. 1773, p. 249. Dau- 

 benton, Hist, et Mem. 1781, p. 369, H. 12. Cuvier, Bulletin de la Societe Philo- 

 mat. No. 15. Le9ons d'Anatomie Comparee, torn. iv. lee. 28. Latham, Trans, of 

 the Linnaean Soc. Savart, Annales de Chimie, xxx. 64, and Froriep's Not. 331. 



History. Dodart on Ancient and Modern Music, Hist, et Mem. 1706, p. 388. 

 Pepusch on the Genera and Species of Music among the Ancients, Ph. Tr. 1746, 

 p. 266. Styles on do. ibid. 1760, p. 695. Hawkins's History of Music, 5 vols. 4to, 

 1776. Burney's Hist, of Music, 4 vols. 4to, 1789. Forkel, Allgemeine Litteratur 

 der Musik, Leipz. 1792. Jones, Asiatic Researches, iii. 55. Busby's Hist, of 

 Music, 2 vols. 1819. 



* Observations sur les Flutes, Mem. de Berlin, 1775. 

 f The work is Traite d'Acoustique, Paris, 1809. 



