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Further, in support of my views, I would point out that the very first known occurrence of B. diazotans was that which had Regent’s Park as its site; and that the first place of attack was in the immediate neighbourhood of Wotherspoon’s house in Cumberland Terrace. This can hardly be disregarded, when it is considered in connection with the other facts which I have mentioned.

At this time of day there can be no question that London formed the focus from which B. diazotans spread throughout the world. I have described the ramifications of the great air-services; and it seems to me obvious that the organisms were carried to and fro upon the surface of the globe by the agency of the aeroplanes. The order of attack at various points indicates this very clearly, in my opinion. First came the American and Egyptian outbreaks; then Uganda and South America; and finally, long after the others, Australia showed traces of the devastation. I have checked the possible dates of arrival in these various places, taking into account the relative swiftnesses of the aeroplanes on the different routes; and the results can hardly be gainsaid. Allowing, as one must, a certain latitude for the time of development of the microbe in various spots, there seems little doubt that the dates of the outbreaks fell into the same succession as the times of arrival of the various London air-services.