1106 



rised. These conclusions are chiefly based on table IV, partly on 

 table V and as lo Concl. VII also on my former investigation, 

 published in these Proceedings. It slionld be remembered that all 

 this holds good only for the West European "climatic district" and 

 partly also for its periphery. 



CONCLUSIONS.^) 



I. — Within each interval of 447, years, to begin with A.D. 

 759.5 (1872.0) the first half is colder than the second. 



(The difference in temperature deviations has been found on 

 an average 20° per 44 winters; after the year 1383 on an 

 average 26°. 



Exceptions or apparent exceptions to this rule: 2 of 26 

 cases since 760; none since 1200). 



II. — The difference between the temperature deviations of suc- 

 cessive intervals of 22^^ years, to begin with 759,5 (1894,25) is 

 alternately negative and positive. 



(Of 51 cases 6 exceptions or seeming exceptions; no excep- 

 tions after the year 1450). 



III. — Within each interval of 89 years, to begin with the year 

 759,5 (1827,5) the first half is colder than the second. 



(The difference in temperature deviations has been found to 

 be on an average 22° per 89 winters. 



Exceptions to the rule: of 13 cases since 760 two, besides 

 two dou-btful ones; since 1116 one exception). 



IV. — The difference between the temperature deviations of suc- 

 cessive intervals of 44V, years, to begin with 759,5 (1872,0) is 

 alternately negative and positive. 



(Of 25 cases 6 (7?) exceptions to this rule, after 1383 

 two exceptions). 



V. — Within each interval of 89 years to begin with 759,5 

 (1872,5) cold wintei's prevail in the first quarter, warm winters in 

 the last quarter, relatively to the mean temperature in the whole period. 



(Of 26 cases 4 exceptions to this rule; after the year 



^) Gf: VV. Koppen "Anzeichen einer 89 j. Periode" (iDdication of an 89 y. Period) 

 Ann. d. Hydrograjjhic a marit. {Met. 1917 ; also J. P. van dek Stok 'Bijdr. 

 Klimaat v. Nederland" (Climate of the Nederlands) in Tyjds. Kon. Ned. Aardrvjksk. 

 Genootschap 1918 n». 3. 



