3^6* SCIENTIFIC NEWS. 



known. He promises us farther inquiries on tliis subject in 

 another paper. 



We must refer to the memoir itself for his other experi- 

 ments, among- which are some interesting ones on changes 

 in the fixed point, and in the point to which the bow is ap- 

 plied, without producing any in the figure or arrangement 

 of the curves. 

 Vibrations of ^ r ' C'dadni concludes his second part with reflections on 

 bells. the vibrations of bells, and of curved sulfates in general, 



and on the coexistence of vibrations in sonorous bodies. 

 He speaks of the theory and hypothesis of Euler respecting 

 the sound of bells; of Rameau's system of the fundamental 

 base ; of the musical s . e o: Tartini, founded on expe- 

 riments, which, according to Mr. Chladni, were known in 

 Germany long before Tartini made xise of them, and which 

 may be considered as the inverse of Rameau^s ; and lastly 

 of the combination, which takes place in certain circum- 

 stances, of the vibratory with other kinds of motion. 



Pronation <f ^ n tne tmr ^ P art tne autnor n »' st considers the propaga- 

 soimd through tion of sound as effected by the air and different aeriform 



different sub- fl u - ]C j s: v ie tb en examines the cases where it takes place 

 stances. . .... 



through the intervention of liquid and solid substances. 



We here find the experiments, which the author made in 

 concert with Prof. Jacquin of Vienna, on the vibrations of 

 various kinds of gas ; and conjectures on the cause of 

 the difference between the observed velocity of the pro- 

 pagation of sound through air, &c, and that given by 

 theory. 



The committee conceive, that the two classes ought to 

 bestow distinguished encomiums on the discoveries of Mr. 

 Chladni respecting the philosophy of sound ; and that it 

 is an object of importance, todirect the attention andemula- 

 tion of the learned to those physico-mathematical researches, 

 to which his discoveries may give rise. 



Signed, de Latepede, Haiiy, Mehul, Gossec, G retry, Le 

 Breton, de Prouy. , 



Imperial 



