The observation of maximum and minimum thermometers in three different classes of situation--_videlicet_, in the areas selected for plantation themselves, at places in the immediate neighbourhood of those areas where the external influence might be expected to reach its maximum, and at places distant from those areas where the influence might be expected to be least. The observation of rain-gauges and hygrometers at the same three descriptions of locality. In addition to the ordinary hours of observation, special readings of the thermometers should be made as often as possible at a change of wind and throughout the course of the short hot breezes alluded to already, in order to admit of the recognition and extension of Herr Rivoli's comparison. Observation of the periods and forces of the land and sea breezes. Gauging of the principal springs, both in the neighbourhood of the areas of plantation and at places far removed from those areas. 1873. FOOTNOTES: [45] Read before the Royal Society, Edinburgh, 19th May 1873, and reprinted from the _Proceedings_ R.S.E. [46] _Jour. Scot. Met. Soc._, New Ser. xxvi. 35. [47] Quoted by Mr. Milne Home. [48] _Atlas Meteorologique de l'Observatoire Imperial_, 1867. [49] _Comptes Rendus de l'Academie_, 29th March 1869. [50] Professor Balfour's "Class Book of Botany," Physiology, chap. xii., p. 670. [51] _Comptes Rendus_, 1867 and 1869. [52] See his paper. [53] _Annales de Chimie et de Physique_, xlv., 1830. A more detailed comparison of the climates in question would be a most interesting and important contribution to the subject. [54] Reviewed in the _Austrian Meteorological Magazine_, vol. iv.; p. 543. [55] _Comptes Rendus_, 28th May 1860. [56] _Ibid._, 20th May 1861. [57] Becquerel, "Climats," p. 141. [58] Scoresby-Jackson's "Medical Climatology." ESSAYS OF TRAVEL ESSAYS OF TRAVEL I DAVOS IN WINTER