Gitt— Theory of the Stratified Discharge in Geissler Tubes. 421 
fore, appear unreasonable to suppose that the real cause of the 
strata may be of this nature. 
With regard to the actual cause of the rib-like formation in 
Kundt’s experiment, there appears a good deal to be proved. A 
discussion of the question will be found in Lord Rayleigh’s 
“Sound.” Tt is interesting to note that the method of Kundt 
has been applied to the determination of the wave-length of notes 
with a period as high as 170,000 vibrations per second (Hdelmann, 
Ann. d. Physik, Bd. II., Heft 3, Juli, 1900, p. 469). 
SCIENT. PROC. R.D.S., VOL. IX., PART IV. 21 
