S18 Mr Watson's Observations on the Temperature 



record the temperature in connection with the elevation ; and 

 from the observations made each day at different heights, bv 

 taking the mean altitude and the mean of the thei mometrical 

 indications,* are obtained the following results : — 



Means of Altitudes and J'emperatures, 



Place. 



Clova Mountains, . . 

 Clova lo Craemar, 

 Ben-na-Buird, . . . 

 Braemar Moors, . . 

 Ben-na-muic-diuch, . 

 Ben Heeal, .... 

 Ben Loyal, .... 

 Ben Hope, .... 

 Ben Nevis, .... 



Ditto, 



Loch Eil Moors, . . 

 Red Cairn, .... 



Means 



M. Alt. 

 in Feet. 



24091 



22271 



26811 



1752 



25901 



1186 



1839i 



19351 



16381 



30861 



12881 



24171 



20791 



Tempe- 

 rature. 



56° 



54.66 



47-75 



49.80 



46.33 



57.10 



60.37 



53 



54,70 



52.42 



62.08 



57.33 



54.7 



Date. 



July 16. 

 17. 

 23. 

 21. 

 24. 

 31. 



Aug. 



Number 

 of Obser- 

 vations. 



U 

 3 

 8 

 6 

 6 

 5 

 4 

 6 

 5 

 8 

 6 

 9 



M^ 



These observations were usually made between 11 a. m. and 

 5 p. M. ; sometimes an hour or two earlier or later. This will 

 probably cause an excess of 2° or 3° above the true temperature 

 for the 24 hours ; so that in general terms (for the observations 

 are not sufficiently numerous to speak with confidence) we may 

 say that the temperature of the Highland Mountains, at a mean 

 elevation of 2000 feet, is about 52° Fahrenheit during the hottest 

 month. The mean temperature of July and August, at Lead- 

 hills, in the south of Scotland, is BQ^, the height above the sea 

 1280 feet. The next table gives the elevation and temperature 

 of the highest and lowest points, of w^hich the record was kept, 

 on each of the before-mentioned days : — 



• An example will more clearly explain this. On the ascent of Ben- 

 na-muicduich, the Sympiesometer indicated as follows : — 



