The publication by the Royal Society of Edinburgh of the hourly observations made at the observatory on the summit of Ben Nevis along with corresponding observations at Fort-William at the sea level is an important contribution to meteorological science. The study of this work reveals at once the important characteristic of the Ben Nevis Observatory. It is situated on a true peak, and that the highest point in the British Islands. Its height above the sea is such that it is usually enveloped in cloud, and its records are for the most part those of an observatory established in the clouds, and in an atmosphere habitually saturated with moisture.