These societates were managed by the great men of business, as our joint-stock companies are directed by men of capital and consequence.  Polybius tells us that among those who were concerned, some took the contracts from the censors:  these were called mancipes, because the sign of accepting the contract at the auction was to hold up the hand.[112] Others, Polybius goes on, were in association with these mancipes, and, as we may assume, equally responsible with them; these were the socii.  It was of course necessary that security should be given for the fulfilment of the contract, and Polybius does not omit to mention the praedes or guarantors[113].  Lastly, he says that others again gave their property on behalf of these official members of the companies, or in their name, for the public purpose in hand.  These last words admit of more than one interpretation, but as in the same passage Polybius tells us that all who had any money put it into these concerns, we may reasonably suppose that he means to indicate the participes, or small holders of shares, which were called partes, or if very small, particulae[114].  The socii and participes seem to be distinguished by Cicero in his Verrine orations (ii. 1. 55), where he quotes an addition made by Verres illegally as praetor to a lex censoria:  “qui de censoribus redemerit, eum socium ne admittito neve partem dato.”  If this be so, we may regard the socius as having a share both in the management and the liability, while the particeps merely put his money into the undertaking[115].  The actual management, on which Polybius is silent, was in Rome in the hands of a magister, changing yearly, like the magistrates of the State, and in the provinces of a pro-magister answering to the pro-magistrate, with a large staff of assistants[116].  Communications between the management at home and that in the provinces were kept up by messengers (tabellarii), who were chiefly slaves; and it is interesting incidentally to notice that these, who are constantly mentioned in Cicero’s letters, also acted as letter-carriers for private persons to whom their employers were known.

Such a business as this, involving the interests of so many citizens, must have necessitated something very like the Stock Exchange or Bourse of modern times; and in fact the basilicas and porticoes which we met with in the Forum during our walk through Rome did actually serve this purpose.[117] The reader of Cicero’s letters will have noticed how often the Forum is spoken of as the centre of life at Rome—­going down to the Forum was indeed the equivalent of “going into the City,” as well as of “going down to Westminster.”  All who had investments in the societates would wish to know the latest news brought by tabellarii from the provinces, e.g. of the state of the crop in Sicily or Asia, or of the disposition of some provincial governor towards the publicani of his province, or again of the approach