CLIMATE OF NORTH AMERICA HUNTINGTON. 



411 



In figure 2 I have added a dotted 

 line. Tliis is the approximate curve 

 of chmatic pulsations in Asia as given 

 in ''Palestine and its Transforma- 

 tion." The two curves disagree m 

 certain places, but on the whole tln^y 

 are in harmony. The disagreements 

 may be due to the absence of data in 

 compiling the Asiatic curve; for in- 

 stance, between 1200 and 1000 B. C. 

 I had no data whatever, and hence 

 merely drew a straight hne. In other 

 cases the fact that indications of arid- 

 ity happened to be especially well pre- 

 served at a certain time, such as the 

 seventh century of our era, may have 

 caused me to carry the Asiatic curve 

 lower than was justifiable. It should 

 be noted, however, that in the fully 

 corrected sequoia curve the lowest 

 point of all in the seventh century 

 A. D. falls at the same time as the 

 lowest point in the Asiatic curve, a 

 significant agreement. Moreover, 

 the longest almost continuous decline 

 anyv\'here apparent in the California 

 curve is from the time of Christ to the 

 middle of the seventh century. The 

 greatest disagreement between the 

 two curves is found about 300 A. D. 

 Whether there actually was disagree- 

 ment at that time, or whether I have 

 made a mistake in the Asiatic curve, 

 I shall not here attem])t to discuss. 

 In general it may be said that the 

 three noticeable depressions in the 

 Asiatic curve, namely, 300, 650, and 

 1200 A. D., are possibly all exagger- 

 ated because special events due ap- 

 parently to increasing aridity hap- 

 pened to cuhninate at those particu- 

 lar epochs. 



In spite of certain distinct disa- 

 greements, the most noticea})le fact 

 about the curves is their agree- 

 ment. Take the epoch centermg 



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 T 



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70O 



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Fig. 2.— Curve of gi'owth of the Sequoia wash' 

 ingtoniana of California (solid line), and 

 changes of climate in Asia (dotted line). 



