"The great deficiency of the Act of 1866, as of all other English legislation on sanitary matters, is that no public prosecutor is appointed. If Vestries neglect to prosecute, and individuals do not see their way to it, people may be killed by infectious diseases to any extent." And the Medical Officer of Health for St. Giles' expressed a similar opinion when he wrote (1870):-- "The duty of making these sanitary improvements should be imperative instead of permissive. It was wise, at first, perhaps, that our sanitary legislation should be tentative and experimental; but experience having proved its necessity it should be made more stringent." But neither of them got so far as to see the natural and simple remedy, that where a local authority for one reason or another would not administer the laws made by Parliament, the central authority should step in and do the work at the cost and expense of the recalcitrant local authority. If one set of people failed in their duty to the public, it was but right that where such tremendous issues were at stake as the health and physical well-being, not merely of the people of one parish but of over three and a quarter millions of people--and all that their health and well-being implied--the administration of the law should be placed in hands that would administer it. That, however, was but part of the great problem, though it would have gone a long way in ameliorating things. The other necessity was the strengthening and altering of the law which itself stood in need of many and large changes before a sure foundation could be laid for the future health of the great community resident in the great metropolis of London. And other matters which ultimately were to have great influence towards the solution of some of the worst of the health difficulties in London were coming into view, and assuming form and substance. Tramways, with their facilities of traffic, were about to be started. In 1869 three private Acts were passed, authorising the construction and working of tramway lines in the metropolis, and in the following year several more private Acts and "The Tramways Act, 1870," which was a general measure. Its main object was to provide a simple, inexpensive, and uniform mode of proceeding in obtaining authority for the construction of tramways, and to give the local authorities the power of regulation and control. In London the Metropolitan Board of Works was constituted the "local authority" under the Act; and that Board was empowered to apply for a Provisional Order itself to construct tramways, and lease them to other persons, and was given, with the approval of the Board of Trade, a compulsory power of purchase after a period of twenty-eight years on certain conditions.