;{(i() Anijh. Li:m)agkh 



iiuMcasod in violoncc hilcr on in llic day willi a more copious fall 

 of snow, 'i'his, the liisl snowstorm, occuired cxaclly a month earlier 

 than in 1U(H), but otherwise under simihir conditions, starting from 

 llu' north, whence the wind veered to NNW., attaining a velocity 

 of about 20 metres per second. As sudden a rise ol" temperature 

 as in 190() did not take place, but yet the temperature rose to -;- 0.2 

 in the course of the night. 



The [)ercentage oi' the moisture in the air was low on an average, 

 often below 50; the lowest percentage of moisture recorded is 36 

 on October 3, 1907. Both in 1U()() and 1907, autumn — or the time 

 when the frost arrives — was accompanied by north-westerly winds 

 which dried up the ground and thus created better conditions for 

 the plants which, after having finished tlieir development, were ready 

 to meet the advance of winter. As regards the majority of the species 

 seeds had been set abundantly. No doubt it also holds good for 

 the buds wliich have been formed, that they are much more protected 

 in a relatively dry condition than if they had been covered with 

 ice before the snow-covering came. Evaporation and the desiccation 

 resulting from it are further prevented by a protective sheath of 

 old leaves (cf. List, pp.23 and 27: Lesquerella and Potentilla piilchella). 



As will be seen from the table, the mean temperature for October 

 appears about equal for both years. The first part of the month 

 was much colder in 1907 than in 1906 ; on the other hand the conditions 

 were reversed as regards the latter part. Otherwise there is a distinct 

 similarity between the two months in many cases; this applies, among 

 other things, to the direction of the wind, which is principally westerly. 

 Between the two points of the compass W. and N., both inclusive, 



1906 show^s 52 readings 

 and 1907 — 57 —, 



next comes calm with 



1906 - 30 — 

 and 1907 — 24 — 



E. is represented by two readings both in 1906 and 1907. 



The different directions of the wind cause some differences in 

 the humidity of the air; the air is usually dry with westerly wind; 

 this applies, at any rate, to the summer-period. When the sea is 

 open the percentage of moisture is somewhat increased during easterly 

 wind or calm. In autumn, however, a low percentage of moisture 

 often coincides with calm, while a higher percentage may occur 

 with wind from the north-west. 



An unusual mildness prevailed in December 1907 during the 



