She asked "Uncle" for his guitar and at once found the chords of the song.
The straight line and the line through the centre parallel to the chords are named conjugate diameters; each bisects the chords parallel to the other.
The chords necessary in this part, which with its supporting bass is called the continuo, were indicated by figures; and the evanescent and delicate tones of the harpsichord; lent themselves admirably to this purpose where solo voices and instruments were concerned.
It has passed through a far greater number of editions than any other work on natural history in the whole world, and has become emphatically an English classic - the graceful simplicity of its style, the elevating tone of its spirit, and the sympathetic chords it strikes recommending it to every lover of Nature, while the severely scientific reader can scarcely find an error in any statement it contains, whether of matter of fact or opinion.
The highest chords he strikes are those of reason and self-love.