* 
66 Influence of Musical Sounds on a Jet of Coal-gas. 
retted hydrogen takes fire in the air, indicate the existence of 
some cohesive force in the gaseous product of combustion (aque 
ous vapor), whose outlines are marked by the opake phosphorie — 
acid? In short, does not the very form of the flame of a “‘fish- 
tail” burner demonstrate that cohesion must exist among the pat- _ 
ticles of the issuing gas? It is well known that, in this burner, — 
the single jet which issues is formed by the union of two oblique 
jets immediately before the gas is emitted. The result is a per 
pendicular sheet of flame. How is such a result produced by the 
mutual action of two jets, unless the force of cohesion is brought — 
into play? Is it not obvious, that such a fan-like flame must be — 
produced by the same causes as those varied and beautiful forms — 
of aqueous sheets developed by the mutual action of jets of 
water, so strikingly exhibited in the experiments of Savart and — 
of Magnus? 
If it be granted that gases possess molecular cohesion, it seems 
to be physically certain, that jets of gas must be subject to 
same laws as those of liquid. Vibratory movements excited i 
the neighborheod, ought, therefore, to produce modifications m 
them analogous to those recorded by M. Savart in relation to jets” 
of water. Flame or incandescent gas presents gaseous matter in 
our ideas in relation to the agency of tubes in developing musical — 
sounds by means of burning jets of gas? Must we not 
upon all burning jets,—as in the case of water-jets,—as mus 
inclined ; and that the use of tubes merely places them in a C0 
dition favorable for developing the tones? It is well known, that 
burning jets frequently emit a singing sound when they are pe 
fectly free. Are these sounds produced by successive explosiol> 
analogous to those which take place in glass tubes? It is vey 
rtain, that under the influence of molecular forces, any cause 
which tends to elongate the flame, without affecting the velocity 
