If the licence […] was costly, it secured to them uninterrupted and extraordinary pecuniary advantages; but on the other hand it subjected them to 'calls' or 'squeezes' for contributions to public works, […] for the relief of districts suffering from scarcity […] as well as for the often imaginary […] damage caused by the overflowing of the 'Yangtse Keang' or the 'Yellow River.'