Vibrates right and left, and then he laughed. He said you were, as usual, as if waiting for me.... The wheels splashed in the telescope--The terrestrial telescope--The Galilean telescope--The prismatic telescope--The reflecting telescope--The parabolic mirror--The compound microscope--The magic-lantern--The bioscope--The plane mirror 253 Chapter XIV.--SOUND AND MUSICAL INSTRUMENTS. Nature of sound--The ear--Musical instruments--The vibration of which is not all: the piece entitled The Kings of Hungary!