The reed velocity and the sound pressure inside the shallot have been recorded in lingual organ pipes as the vibrating reed length is varied by means of the tuning wire (Stimmkrücke) (in an F3 trompette pipe, for example, the sounding frequency was varied from 157 to 325 Hz). Without the resonator, the frequency is a continuous function of the reed vibrating length, but when the conical resonator is added, the pipe frequency jumps abruptly from below to above each resonance frequency of the sonator. When the natural frequency of the reed (excited by plucking) was varied from 138 to 316 Hz by changing its vibrating length, the pipe frequency changed from 170 to 340 Hz. Reed closure may induce a strong acoustical oscillation in the shallot at a high frequency (approximately 1700 Hz in the F3 trompette pipe) which strengthens a certain range of harmonics and gives rise to a formant in the pipe sound. The oscillation frequency in the shallot rises rapidly as the reed closes it, and reaches a frequency near the resonance frequency of a tube of comparable length with one closed end. When the resonator is attached, the shallot oscillations are strongly damped. a)Permanent address: Physics Dept., Northern Illinois University, DeKalb, IL 60115.