First edition, second issue, of the famous book usually known as ‘the second Enquiry’. Essentially a reworking of Book III of the Treatise, ‘Of Morals’, Hume composed it during the two years that he spent mostly at his brother’s home at Ninewells, beginning in 1749. Both issues came out in late November 1751. Hume is often quoted as saying that ‘of all my writings, historical, philosophical, or literary, [it is] incomparably the best’ (‘My Own Life’). Chuo 44.