(1) The study of the meteorological circumstances prevailing in the United Kingdom confirms the conclusions reached in India that the combined influence of temperature and humidity plays an important part in determining the conditions necessary for the transmission of malaria.

(2) The part assigned to temperature and humidity points to the conclusion that the period of active infection in England is ordinarily limited to the months of July and August.

(3) The part attributed to temperature accounts for the geographical distribution of the endemic area of malaria in the British Isles and explains its limitation to certain parts of England.

(4) The combined influence of temperature and humidity appears to afford an explanation of the precise location of the endemic centres of malaria within the above area.

(5) The part assigned to temperature and humidity elucidates certain points in connexion with the endemiology of malaria in England, and it offers an explanation of the conditions known as “Malaria sine Paludism” and “Paludism sine Malaria.”

(6) The part played by the meteorological factors throws light on the past history of malaria in England and it helps to explain its gradual decline.