Interesting examples of far-travelled northern plants recently described by Professor Engler of Berlin afford additional illustrations of the general principles enunciated many years ago by Sir Joseph Hooker. A species of flowering Rush, _Luzula spicata_ var. _simensis_, occurs at an altitude of 3600 metres in Abyssinia and on Kilimanjaro. _Luzula spicata_ is found in the whole of the Arctic and Subarctic belt in Scotland, Auvergne, the Jura mountains, and elsewhere. The species probably began its career in the northern hemisphere where it grew abundantly on the higher ground in the Arctic Circle: it eventually travelled along the North American Andes and appeared in Mexico under a guise sufficiently distinct to warrant the use of another name, _Luzula racemosa_. In an eastern direction it reached the Himalayas and is represented in Abyssinia by a closely allied form. From Abyssinia to Kilimanjaro _Luzula spicata_ 'had to travel a long distance; but it is not impossible that it either still exists or has existed previously on a few of the high mountains between Abyssinia and Kenia, from which, having advanced to the Kilimanjaro, it again produced new forms.... At any rate, it is impossible to do without distribution of seeds of alpine plants by air-currents or by birds from one mountain to the other in explaining the history of distribution'(18). The majority of British plants are identical with species in Central and Northern Europe: of these, some are among the most widely spread English species, _e.g._ the Daisy and Primrose, while others, such as the Oxlip (_Primula elatior_), are confined to the Eastern counties, and others, such as the Cheddar Pink (_Dianthus caesius_), are restricted to Western counties.