ILLUSTRATIONS 



Vll 



PAGE 



45. Average cycle recurrence in Grant 

 Park sequoias in 2100 years 103 



46. Frequency periodograms of Cen- 

 tral Pueblo Chronology (CPC) 

 and Sequoia Chronology (SVI). . . . 108 



47. Arizona tree growth and Cali- 

 fornia rainfall; curves of 1909 116 



48. First western correlations, 1909. . . 117 



49. Western correlations, 1914 (pub- 

 lished in "The Climatic Factor"— 



E. Huntington) 118 



50. Correlations, 1919 119 



51. Integrations on 11.4 years of data 

 mostly between 1850 and 1900; 

 arranged according to prominence 

 of second maximum of Hellmann 

 cycle 120 



PAGE 



52. Hellman cycle in Flagstaff pines, 

 FLC-FLU, since 1420 121 



53. Correlation periodograms (Alter) 

 for 



(a) Arizona trees, 1700-1920 



(b) California and Oregon trees, 

 1700-1920 127 



54. 57-year cycle in Arizona trees, 

 A.D. 1168 to 1503 128 



55. A group of periodograms to show 

 resemblance of terrestrial to solar 

 cycles 129 



56. Western cycles compared to simple 

 fractions of 34 years 130 



57. Construction of a frequency per- 

 odogram from ten groups in the 

 Central Pueblo area 148 



58. Summation curves 156-163 



I 



