On the relation between tropical and extra-tropical cyclones

The author has long been engaged in the study of cyclones in the temperate zone, as illustrated by those in Great Britain; but as doubts have been expressed by many meteorologists as to the identity between tropical and extra-tropical cyclones, he visited, in the year 1886, the observatories at Mauritius, Madras, Calcutta, Manila, Hong Kong, and Tokiyo, so as not only to procure more published materials for the investigation, but still more to learn from conversation with those who have had great experience of tropical hurricanes, some minute details of weather which were of primary importance, but which could not always be extracted from existing reports. Though he was not fortunate enough to experience a hurricane himself, still he obtained sufficient information to enable him to arrive at a very definite conclusion on the matter, and now has the honour of laying before the Royal Society the results of his investigations.