convinced, be emphasised much more than it is. Woollen clothing should always be worn, and an extra wrap in the evening is indispensable. The white population in the Congo district are gradually coming to the conclusion that a house, or station, set on a hill is always a danger to health. A house situated on higher ground than the surrounding country is exposed to every wind that blows, and the difference of temperature is sufficient to make it dangerous for anyone in a heated condition to return in the evening to the cooler situation.

The statistics of sickness and death rates of the stations in the Congo on high altitudes, compared with those in valleys or actually on river banks, are found to be enormously in favour of those low down, despite the accepted theory with regard to malaria. There seems to be little doubt