Count Schaffgotsch’s Acoustic Experiments. 543 
justible labial pipe, by the contra-D, D, D, the first treble D, and 
the second treble D of a harmonium, but by no single C sharp 
or D sharp of this powerful instrument. It is also affected by 
the third treble D of a clarionet, although only when quite 
close, The sung note also acts when it is produced by inspira- 
tion (in this case the second treble), or when the mouth is turned 
from the flame. . 
9. In immediate proximity the note G sung is effective. 
Some influence is exerted by noises, but not by all, and often 
not by the strongest and nearest, evidently because the exciting 
tone is not contained in them. 
10. The flame burning quietly in the interior of the D-tube 
was about 2°5 millims. in length. In the next room, the door 
of which was open, the four legs of a chair were stamped simul- 
taneously upon the wooden floor. The phenomenon of the che- 
mical harmonics immediately occurred. A very small flame is 
of course extinguished, after sounding for an instant, by the noise 
of achair. A tambourine, when struck, acts sometimes, but in 
general not. 
11. The flame burning in the excited, singing condition in 
the interior of the D-tube, the latter was slowly raised as high 
as possible without causing the return of the flame to the ordi- 
nary condition. The note, the first treble D, was sung strongly 
and broken off suddenly at a distance of 15 metre. The har- 
monic tone ceased, and the flame fell into the state of repose 
without being extinguished. 
12. The same result was produced by acting upon the draught 
of air m the tube by a fanning motion of the open hand close 
above the upper aperture of the tube. 
13. In the D-tube there were two burners close together; one 
of them, 0°5 millim. in aperture, opened 5 millims. below the other, 
the diameter of which was 1 millim.or more. Currents of gas, inde- 
pendent of each other, flowed out of both; that flowing from the 
narrower burner being very feeble, and burning, when ignited, 
_with a flame about 1-5 millim. in length, nearly invisible in the 
day ; the first treble D was sung at a distance of 3 metres. The 
strong current of gas was immediately inflamed, because the 
little flame situated below it, becoming elongated, flared up into 
it. By astronger action of the tone the small flame itself is 
extinguished, so that an actual transfer of the flame from one 
burner to the other takes place. Soon afterwards the feeble 
current of gas is usually again inflamed by the large flame, and 
if the latter be again extinguished alone, everything is ready for 
a repetition of the experiment. 
14. The same result is furnished by stamping with the chair, 
&e, It is evident that in this way gas-flames of any desired size 
