M. S*** = Anthony Ashley Cooper, Earl of Shaftesbury.
Denis Diderot's translation of Shaftesbury's 'An inquiry concerning virtue'.
The imprint is false; printed in Paris, originally with the title and imprint: 'Philosophie morale reduite a ses principes, ou essai de M. S***. Sur le mʹerite et la vertu', new edition, "A Venise, par la Sociʹetʹe des librairies", 1751.
Reproduction of original from Cambridge University Library.