It was in this respect, as employers of labour, that the societies of the time were free from the anxieties and restrictions that beset the modern employment of capital. Except in the rare case where the contractors had leased arable land and sublet it to its original occupants,--the treatment which seems to have been adopted for the Campanian territory[137]--there can be no question that the work which they controlled was done mainly by the hands of slaves. They were therefore exempt from the annoyance and expense which might be caused by the competition and the organised resistance of free labour. The slaves employed in many of these industries must have been highly skilled; for many of these spheres of wealth which the State had delegated to contractors required peculiar industrial appliances and unusual knowledge in the foremen and leading artificers. The weakness of slave-labour,--its lack of intelligence and spirit--could not have been so keenly felt as it was on the great agricultural estates, which offered employment chiefly for the unskilled; and the difficulties that might arise from the lack of strength or interest, from the possession of hands that were either feeble or inert, were probably overcome in the same uncompromising manner in the workshop of the contractor and on the domains of the landed gentry. The maxim that an aged slave should be sold could not have been peculiar to the dabbler in agriculture, and the _ergastulum_ with its chained gangs must have been as familiar to the manufacturer as to the landed proprietor.[138] As to the promoters and the shareholders of these companies, it could not be expected that they should trace in imagination, or tremble as they traced, the heartless, perhaps inhuman, means by which the regular returns on their capital were secured.[139] Nor is it probable that the government of this period took any great care to supervise the conditions of the work or the lot of the workman. The partner desired quick and great returns, the State large rents and small tenders. The remorseless drain on human energy, the waste of human life, and the practical abeyance of free labour which was flooding the towns with idlers, were ideas which, if they ever arose, were probably kept in the background by a government which was generally in financial difficulties, and by individuals animated by all the fierce commercial competition of the age.