Montesquieu 
Montesquieu’s Considerations on the Causes of the Grandeur and Decadence of the Romans [PDF ebook] 
A New Translation, Together With an Introduction, Critical and Illustrative Notes, and an Analytical Index

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. It will be seen that the book is by no means a mere translation of Montesquieu’s treatise; but that, beyond this, the Romans are used as a nexus for all antiquity, and the general movement of the world’s civilization sought to be inferred.