ILLUSTRATIONS 



PLATES 



PAGE 



Plate 1. 



A. Fire injury on D-12 (stump) showing 



repair and gross rings and in- 

 closed bark 14 



B. Center of oldest sequoia, D-21, show- 



ing ring grown in 1305 B.C.; three 

 pins stand at 1300 b.c 14 



Plate 2. 



A. Weathering in 60 years, CV-4; bark 



gone, sap wood mostly gone; Cala- 

 veras Grove 20 



B. Weathering in 125 years; CV-3, 



sapwood and center entirely 



gone ; Calaveras Grove 20 



Plate 3. 



A. Forms of v-cut on stumps 22 



B. Complacent sequoia rings, D-8, 



grown in wet basin 22 



C. Sensitive sequoia rings, D-4, grown 



in uplands 22 



D. Hyper-sensitive or erratic yellow 



pine rings, Pr. 62, grown near 

 lowest yellow pine levels, Arizona 22 

 Plate 4. 



A. Fallen sequoia, Enterprise, in which 

 vertical uniformity tests were 

 made 26 



Plate 4 — continued. 



PAGE 



B. Sequoia "California," Enterprise; 



and Mr. C. A. Elster 26 



Plate 5. 



A. Plotting micrometer 38 



B. Longitudinal plotter 38 



C. White cyclograph 38 



Plate 6. 



A. Site of 500-year pines, Flagstaff, 



Fl. 35, in foreground; looking 

 south 58 



B. Stump of 640-year pine, Fisher's 



Tank, Flagstaff 58 



Plate 7. 



A. Sequoia topography, ridges; area of 



D-l, 2, 3, 4, 5, 18, 19, 28, 29 

 and 30 104 



B. Sequoia topography, basins; area of 



D-6, 7, 8, 9, 10, 11 and 27 104 



Plate 8. 



Spruce, S-14, from South Sweden, show- 

 ing sunspot cycle; wet climate 

 reaction. Dots give dates of sun- 

 spot maxima beginning with 1830 126 

 Plate 9. 



Cyclograms 132 



TEXT-FIGURES 



PAGE 



1. Heartwood rings at different heights in 

 the sequoia 25 



2. Sapwood rings in fallen sequoia 26 



3. Mean sensitivity and soil moisture .... 29 



4. Arizona zone, smoothed group curves. . 70 



5. Rocky Mountain zone, smoothed 

 group curves 78 



6. Coast zone, smoothed group curves ... 84 



7. Prescott rainfall and tree-growth 98 



8. Flagstaff rainfall and tree-growth, 

 with comparison curves; tree-growth 

 shows close relation to winter pre- 

 cipitation 99 



9. Cibecue drought record traced directly 

 from autoplot 100 



10. Sequoia growth and rainfall 100 



11. Land contours and annual growth of 

 sequoias in Redwood Basin 104 



PAGE 



12. Ring-size, sensitivity, and rainfall 

 correlations, Prescott 105 



13. Pike's Peak area mean curve, PPM; 

 average of six groups, standardized 

 and smoothed 121 



14. Sierra Nevada area mean curve, SNM ; 

 average of four groups, standardized 

 and smoothed 121 



15. Cycles in western zones 124 



16. Sequoia cycles 125 



17. Flagstaff century curve, FLC, a.d. 

 1285-1700 ; standardized and smoothed 127 



18. (1) Flagstaff area mean curve, FAM; 

 average of eight groups, standardized 

 and smoothed; (2) synthetic curve; 



(3) residuals 128 



19. Details of cyclogram patterns in 

 Plate 9 132 



