(538 



MR R. C. MOSSMAN ON 



very low temperature and high humidity as compared with Fort- William prevails in 

 the Glen, in striking contrast to the warmth and dryness typical of Form. A further 

 point of note is the very irregular distribution of temperature that was found to prevail 

 in the valley, even on days in which no very special abnormalities were shown by an 

 inspection of the data from Fort- William and Achariach. The air in the Glen would 

 often appear to be made up of sheets of very different temperatures, and local Fohn 

 of restricted extent is common. Doubtless from an orographical standpoint Glen Nevis 

 is but an insignificant hollow, but the importance and interest of the results obtained 

 cannot be judged from the point of view of mere local climatology, since the phenomena 

 observed equally apply to regions of the earth where the natural features and physical 

 processes are on a much grander scale than in this secluded Highland glen. 



Table I. — Mean Monthly Values at Ben Nevis, Fort-William, and Achariach from Hourly Observations, 



October 1901 to February 1902. 



Ben Nevis. 



1901. 

 October . 

 November 

 December 



1902. 

 January . 

 February. 



Pressure. 



Tem- 

 perature. 



Inches. 

 5-250 

 5-470 

 4-910 



5-316 

 5-199 



30-9 

 28-4 

 23-2 



24 

 22-1 



Sunshine. 



Hours. 

 15-3 

 44-4 

 15-8 



31-4 

 63-7 



Cloud. 



% 

 89 



85 

 76 



Wind 

 Force. 



0-12. 

 2-57 

 1-97 

 2-15 



1-99 

 2-71 



Rain. 



Inches. 

 19-55 

 15-09 

 25-43 



24-75 

 3-36 



Wind Direction. 



N. N.E. E. S.E. S. S.W. W. N.W. Calm 



% 

 15 

 40 

 41 



32 

 19 



% 



6 



13 



7 



15 



% 

 2 

 3 

 5 



% 

 20 



9 

 27 



% 



16 



9 



6 



16 



% 

 19 



7 



13 

 9 



% 



14 



16 



4 



i 11 

 10 



13 

 1 



1901. 

 October . 

 November 

 December 



1902. 

 January . 

 February . 



Fort- William. 







Pressure. 



Tem- 



Sunshine. 



Rain. 





perature. 









1 Inches. 





Hours. 



% 



Inches. 



' 9-791 



46-5 



58-7 



23 



9-55 



0-087 



42-8 



40-1 



23 



4-64 



9-486 



37-9 



11-5 



9 



10-69 



9-959 



38-6 



27-7 



18 



10-03 



9 841 



36-0 



62-2 



31 



1-07 



ACHAKIACH. 



1901. 

 October . 

 November 

 December 



1902. 

 January . 

 February . 



Pressure. 



Tem- 

 perature. 



Sunshine. 



Inches. 





Hours. 



9-792 



47-6 



18-8 



0-088 



43-1 



3-3 



9-488 



37-7 



o-o 



9-959 



38-2 



o-o 



9-842 



35-0 



11-3 



Rain. 



Inches. 



9-62 



5-42 



11-80 



11-02 

 1-76 





