67 



+ 10'G° C. (51*1° F.) at 1 p.m., and the solar radiation was 

 51-7° C. (125-1° F.). On the 26th, at 7 a.m. (which may be 

 taken as abont the minimum of the night), the temperature 

 was -7-2° C. (19-0° F ) but rose at 1 pin. to 9-9° C. (49'9° F.). 

 On the 27th, at 7 a.m., we had -6-2° C. (20-9" F.), and at 1 

 p.m., 10-2° C. (50-4° F.), with solar radiation 48-9° C. (120-0' 

 F.). On the 28th, at 7 a.m., -5-5° C. (22-1° F.), at 1 p.m., 

 5-2° C. (41-4° F.), with solar radiation 46-6° C. (115-9° F.). 

 The nights were clear, and a terrestial radiation thermo- 

 meter would have shown about zero Fahrenheit each night. 



It will be seen that the days were warm, with a very 

 powerful sun, while the nights were clear and cold. On 

 the slopes in question, the earth was softened very soon 

 after the sun appeared above the mountains, and about two 

 hours after this, all the peculiar ice forms examined had 

 been melted awaj^, therefore, to study them, these slopes 

 must always be visited early, though they may be found 

 under less favourable circumstances, and with different 

 aspects at other times. 



On the first day these forms averaged about an inch. 

 On the second some were as much as two, but most were a 

 little more than one inch. The third day when the earth 

 was becoming drier, was the most instructive, as then at 

 the upper part of the earth slope, which was the driest, the 

 crystals were only a quarter of an inch long, while below, 

 where the earth was still soaked they were two inches lono-. 



I have not this year found any case of their occurring in 

 several layers, though I have previously seen it, and the 

 cause is no doubt an interruption in the meteorological 

 conditions. Besides the straight rods, there are often some 

 bent into a half circle, or into reversed fl shape, and 

 frequently in the lower part of a layer the filaments are 

 more numerous than in the upper part. As far as my 

 observations go no trace of these peculiar forms is to be 

 found upon the turf. 



/ . t r-1 era A C3 V . 



