concerning which a well-educated female, who had seen the world, might
be expected to have information." Furthermore, he extols the precision
and accuracy of her execution and intonation, and the thrilling quality
of her voice.

Brydone, who appears to have been fascinated with this siren, has an
amusing apology for her carelessness of her duties in England, which he
insists was not caprice, but inability to sing. He says: "And this I can
readily believe, for that wonderful flexibility of voice, that runs
with such rapidity and neatness through the most minute divisions, and
produces almost instantaneously so great a variety of modulation, must
surely depend on the very nicest tones of the fibers; and if these are
in the smallest degree relaxed, or their elasticity diminished, how is
it possible that their contractions and expansions can so readily obey
the will as to produce these effects? The opening of the glottis which
forms the voice is so extremely small, and in every variety of tone its
diameter must suffer a sensible change; for the same diameter must ever
produce the same tone. So _wonderfully_ minute are its contractions and
dilatations, that Dr. Kiel, I think, computed that in some voices its
opening, not more than the tenth of an inch, is divided into upward
of twelve hundred parts, the different sound of every one of which is
perceptible to the exact ear. Now, what a nice tension of fibers must
this require! I should imagine even the most minute change in the air
causes a sensible difference, and that in our foggy climate fibers would
be in danger of losing this wonderful sensibility, or, at least, that
they would very often be put out of tune. It is not the same case with
an ordinary voice, where the variety of divisions run through and the
volubility with which they are executed bear no proportion to that of a
Gabrielli."