applying the bow to the strings: with stronger or lighter pressure;
near the bridge, which renders the tone hard and brilliant, and over
the end of the finger-board, which softens it; in a continuous manner
(_legato_), or detached (_staccato_). Weird effects in dramatic music
are sometimes produced by striking the strings with the wood of the
bow, Wagner resorting to this means to delineate the wicked glee of
his dwarf _Mime_, and Meyerbeer to heighten the uncanniness of
_Nelusko's_ wild song in the third act of "L'Africaine." Another class
of effects results from the manner in which the strings are "stopped"
by the fingers of the left hand. When they are not pressed firmly
against the finger-board but touched lightly at certain places called
nodes by the acousticians, so that the segments below the finger are
permitted to vibrate along with the upper portion, those peculiar
tones of a flute-like quality called harmonics or flageolet tones are
produced. These are oftener heard in dramatic music than in
symphonies; but Berlioz, desiring to put Shakespeare's description of
Queen Mab,

"Her wagon-spokes made of long spinner's legs;
The cover, of the wings of grasshoppers;
The traces, of the smallest spider's web;
The collars, of the moonshine's watery beams--"

into music in his dramatic symphony, "Romeo and Juliet," achieved a
marvellously filmy effect by dividing his violins, and permitting some
of them to play harmonics. Yet so little was his ingenious purpose
suspected when he first brought the symphony forward in Paris, that
one of the critics spoke contemptuously of this effect as sounding
"like an ill-greased syringe." A quivering motion imparted to the
fingers of the left hand in stopping the strings produces a