30 VEGETATION OF THE PEAK DISTRICT [CH. 



registered at the two lower altitudes^ respectively, and 

 (3) December 21st, when — 5*4'^ C. was registered at 335 metres \ 



On the days when observations were made, the temperature, 

 during 1908, did not fall to zero (C.) from May to November 

 inclusive, nor, during 1909, from April to October inclusive. 



The following table shows the number of days during 1908 

 and 1909 when the temperature failed to rise above zero at 

 an altitude of 350 metres : — 



There is very little growth discernible in the vegetation of the 

 Peak District at altitudes above about 1100 feet (335 m.) until 

 the month of May : growth almost ceases in October ; and from 

 November to April inclusive, weather of a wintry type alter- 

 nating with moderately mild intervals may be expected. These 

 are much more severe conditions than exist in the lowlands, and 

 are doubtless related to the meagre flora of the uplands, as 

 the edaphic conditions of both the lowlands and the uplands of 

 England in the latitude of the southern Pennines are practically 

 identical. 



Direction of the Wiiid 



The figures in the tables on p. 31 are arranged to show, as far 

 as is possible, the relative prevalence of warm and moist winds, 

 i.e., westerly and southerly winds (N.W. to S.S.E.) and of dry 

 and cold winds, i.e., northerly and easterly winds (S.E. to 

 N.N.W.). It will be seen that the warm and moist winds 

 prevail approximately on two days out of every three, and that 

 (as might have been predicted) there is little change of direction 

 at the three chosen altitudes. Direction of wind therefore is 

 1 Readings at the upper altitudes on these days were incomplete. 



