THE WEATHER CYCLE 7 I 



records of atmospheric pressure in India and 

 Argentina ;*. there is the well-known cycle of 

 1 1 r / 9 years ; and there is a longer period 

 variation, of which the length has been estab- 

 lished by Dr. W. J. S. Lockyer at about 35 

 years.t 



CHAPTER VI. HISTORIC RECOGNITION OF 

 BRUCKNER'S PERIOD. 



It may be urged against the validity of 

 Bruckner's weather cycle that, if it exist, it 

 should have been recognised centuries ago, and 

 long since placed beyond the range of contro- 

 versy. But the meteorological cycle will be 

 obvious to the casual observer only in areas of 

 unusual meteorological simplicity, and where 

 one meteorological factor is of great importance. 

 Holland occupies such a position. It is part of 

 the meteorological province of West Europe, 

 and floods are of extreme importance to it. 

 Bacon's essay on the " Vicissitudes of Things " 

 announces the Dutch belief in a 35 years' cycle 



* Sir Norman and VV. J. S. Lockyer, " On some Phenomena which 

 suggest a short period of Solar and Meteorological Changes," Proc. 

 Royal Soc., Vol. LXX, 1902, pp. 500-504 ; " On the Similarity of the 

 Short-period Pressure Variation over large Areas," Ibid., Vol. LXXL, 

 1903, pp. 134-135, 2P 1 - 



tW. J. S. Lockyer, "The Solar Activity, 1833-1900, Ibid., Vol. 

 LXVIII., 1901, p. 294. 



