1.00 — 

 0.90 — 

 0.80 — 



1742 



1903 



1111 



I I I I < I 



2 4 6 8 10 12 14 16 18 20 22 

 Years 



Fig. 44 — Hellmann cycle in recent sequoia records. Running means of three 

 successive cycles of 23 years ("triple lag" method, incomplete after 1891). 



102 



