THE METEOROLOGY OF GLEN NEVIS 665 



Temperature of River and Burn. — The temperature of the Nevis and a burn near 

 the house was taken daily at 2 p.m. 



Rainfall. — Amount was measured at 9 a.m., and the quantity set down to the 

 previous day. The greatest amount for each month is indicated by bold type. 



Rainband. — The thickness of the rainband in the spectrum of sunlight was 

 measured at 2 p.m., and entered on a scale of 0-7. The standard of comparison 

 was the lines D, b, and F, to which values corresponding to 2, 4, and 7 were given. 



Cloud. — The amount and species of cloud were noted at each observation hour, but 

 only the former is given. The presence of mist was noted on the Cairn Dearg of Ben 

 Nevis (3348 feet), Sgor-a-Mhaim (3601 feet), the Meall Cumhann (2306 feet), and 

 after 25th October on the Corrie Derrack or Mullach nan Coirean (3077 feet). When 

 all the hills were clear the symbol is entered ; when all covered, a + . Hills actually 

 in mist are otherwise distinguished by numbers, in which 1 refers to the Cairn Dearg 

 of Ben Nevis, 2 to Sgor-a-Mhaim, 3 to the Meall Cumhann, and 4 to the Corrie Derrack. 

 It was sometimes impossible in the evening to see the hills, such cases being entered 

 with a mark of interrogation ; but generally speaking, when there was moonlight there 

 was no difficulty in making this class of observation. The height of the base of the 

 lower clouds was also noted when possible, and is given in the notes, p. 678. 



Sunshine. — There was no sunshine recorder, but the estimated monthly totals are 

 given in Table I., p. 638. Owing to the steepness of the surrounding hills, the sun did 

 not shine on the station from 6th November 1901 to 31st January 1902. The total 

 possible was about four hours at the beginning of October, and barely three hours at 

 the end of February. At the middle of October (17th) the sun set behind the hills at 

 2.40 p.m., and by 3rd November the possible sunshine was reduced to one hour, from 9.45 

 to 10.45 a.m., when the sun set. 



Weather and Remarks. — A general summary is given in the notes of the weather 

 (p. 678). " River in flood" means that the waters rose so as to cover the large boulder 

 in the River Nevis just above the falls near Achariach. 



Total Monthly Rainfall recorded by the gauge near the head of Glen Nevis (see 



p. 635) :— 



November 1901 ...... 5-92 inches. 



December ....... H'57 ,, 



January 1902 1013 „ 



February ,, . . • ■ .1*72,, 



[Table IX. 



