PLATES 



FACING PAGES 



The Earliest Known Land Flora (Figs. 1, 2-3, 4, 5) 



134, 137, 138, 141 



Crystal Structure (I, Figs, a, l ; II, Figs, a, b) ... 190, 196 



Isotopes and Atomic Weights (Fig. 2) ... ... ... ... 302 



A 1 isolate Measurements of Sound (Fig. 2) ... ... ... 408 



Cloudland Studies (Figs. 6, 9-10, 11, 13-14, 16-20) 



422, 426, 428, 434, 436 

 Biological Studies in Madeira 562, 563, 565, 568, 574 



