diseases wax and wane must be borne in mind, and should prevent us from indulging in a feeling of false security. WHAT IS THE OUTLOOK? Judged by our present standard of knowledge, have we a right to hope that London is likely to remain free from epidemics? There are certain facts which make me seriously doubt the permanence of the present state of health in London. The first of these is the fact that some of our hygienic measures have tended to produce overcrowding of houses, which is infinitely the greatest of all sanitary evils. Formerly the sanitary arrangements of houses were such that without some garden or back premises they would have been uninhabitable, and a reference to Aggas’s map, or Norden’s map, or Newcourt’s map, will show that in Old London a large proportion of the houses had gardens or back premises large enough to be shown on a map. These maps also show that in Charles II.’s time, just before the plague, the overcrowding of houses in London was much more marked than in the days of Elizabeth. When every drop of water and all the fuel used had to be carried to the upper storeys by hand, there were practical inconveniences attending upon very high houses which prevented them from being built to any great extent. Now all is changed. Our system of sewerage has made it possible to build houses with no curtilage whatever, and with no outlet but a hole, and the possession of a high pressure of water (the result of steam power) and the modern system of gas has made it possible to have houses of any height, without any great inconvenience to the occupants. “Five hundred rooms, passenger and luggage lifts to every floor, 1,000 electric lights, hot and cold water laid on to every room, bath-rooms on every floor,” is the kind of advertisement put forward by an eight-storeyed hotel without an inch of curtilage. Without steam power, without water under pressure, and without water-carried sewage, such Yankee monstrosities were not possible, whereas nowadays the loftier the hotel so much the greater is the profit, because extra storeys do not increase the ground-rent.