146 F. Waldo — Bruckner '* Klimaschwankungen. 



Ratio Average Average 



Max : min. min. max. 



East part of England. 1-18 599 mm 744 



North Germany 1'23 573 705 



S.W.Eussia 1-26 447 570 



S.E.Russia T40 273 384 



Ural Mt. Region 1'36 350 480 



W.Siberia.. 2-31 149 347 



E.Siberia . 1'59 355 564 



Deccan... 1*24 



U. S. America, W. Coast 1-38 379 517 



" " far western interior 1-42 483 684 



" " Southern part 1-36 



" " Eastern interior (Ohio, etc.?).. 1-20 890 1059 



Thus we see that in West Siberia 2*3 times as much rain 

 falls in the rainy period as in the dry period. 



The observations along the east coast of the United States, 

 some of the islands of the Atlantic Ocean, and the Irish coast, 

 show minima at about the time of these maxima at the inte- 

 rior ; and if these be taken to represent the Atlantic Ocean 

 rain-fall, then there exists in the case of this ocean a compensa- 

 tory oscillation of rain-fall, the reverse of the oscillations on 

 the land. We have in reality during long periods, a shifting 

 back and forth of the isohyetal lines (lines of equal rain-fall). 

 The amount of this for various isohyetals is shown in the fol- 

 lowing table ; in the first columns for the period from the 

 minimum of 1861-65 to the maximum of 1881-85, and in the 

 second column for the average maximum and minimum. 



Displacement in Kilometers. 

 Counting + towards inland. 



Old "World. N. America. 



Isohyetals. West side. "West side. 



1000 mm —1000 —600 200 TOO 



900 — 500 -200 300 500 



800 + 300 100 400 600 



700 +1500 1000 500 500 



600 + 400 1600 1200 1100 



500 + 600 1000 2000 2000 



400 800 vanishes vanishes 

 300 vanishes vanishes 



It has been pointed out before what an important factor this 

 displacement becomes in investigating questions concerning 

 any actual increase of rain-fall. There have been found 

 periods of rain-fall with the following maxima and minima ; 

 the former being given in large type and the latter in small 

 type : 



1691-1715 1806-25 



1716-35 1826-40 



1736-55 1841-55 



1756-70 1856-70 



1771-80 1871-85 



1781-1805 



