It contains a set of twelve sonatas, for various instruments, composed by George Frideric Handel.
[1] The 1732 edition (which displays at the bottom of the title page the legend "Note: This is more Corect [sic] than the former Edition") was mostly reprinted from the plates of an earlier 1730 publication, titled Sonates pour un Traversiere un Violon ou Hautbois Con Basso Continuo Composées par G. F. Handel—purportedly printed in Amsterdam by Jeanne Roger, but now shown to have been a forgery by Walsh (dated well after Jeanne Roger's death in 1722).
[2] Each sonata displays the melody and bass lines—with the expectation that a competent keyboard player would supply the omitted inner parts based on the figured bass markings.
By modern-day standards, the music in the publication has a primitive appearance—with squashed notes and irregular spacings, stems and bar widths—as can be seen in the image of page 1 (reproduced below in this article).
Despite the titles in both editions, four of the sonatas in each are for a fourth instrument: the flauto (recorder).