The _Populus_ or _Plebs_ of a municipal town of the early Empire is often mentioned in the inscriptions along with the _Ordo_ and the Augustales, generally in demanding some benefaction, or in doing honour to some benevolent patron.(1416) They also appear as recipients of a smaller share at public feasts and distributions. They occasionally engage in a fierce conflict with the higher orders, as at Puteoli in the reign of Nero, when the discord was so menacing as to call for the presence of a praetorian cohort.(1417) The election placards of Pompeii also disclose a keen popular interest in the municipal elections.(1418) But the common people are now as a rule chiefly known to us from the inscriptions on their tombs. Fortunately there is an immense profusion, in all the provinces as well as in Italy, of these brief memorials of obscure lives. And although Roman literature, which was the product of the aristocratic class or of their dependents, generally pays but little attention to the despised mass engaged in menial services or petty trades, we have seen that the novel of Petronius flashes a brilliant light upon it in the reign of Nero. The immense development of the free proletariat, in the time of the early Empire, is one of the most striking social phenomena which the study of the inscriptions has brought to light. It has sometimes been the custom to speak of that society as depending for the supply of its wants entirely on slave labour. And undoubtedly at one time slave labour occupied the largest part of the field of industry. A household in the time of the Republic, of even moderate wealth, might have 400 slaves, while a Crassus would have as many as 20,000, whom he hired out in various industries.(1419) But several causes conspired gradually to work a great industrial revolution. From the days of Augustus, the wars beyond the frontier, which added fresh territory and yielded crowds of captives to the slave-markets, had become less frequent. And it is probable that births among the slave class hardly sufficed to maintain its numbers against the depletion caused by mortality and manumission. The practice of emancipating slaves of the more intelligent class went on so rapidly that it had even to be restrained by law.(1420) Masters found it economically profitable to give skilful slaves an interest in the profits of their industry, and the _peculium_, which was thus accumulated, soon provided the means of purchasing emancipation. At the same time, the dispersion of colossal fortunes, gained in the age of rapine and conquest, and squandered in luxury and excess, together with the exploitation of the resources of favoured regions, which were now enjoying the blessings of unimpeded commerce, rapid intercommunication, and perfect security, must have given an immense stimulus to free industry. A very casual glance at the inscriptions, under the heading _Artes et Opificia_,(1421) will show