FACSIMILES OF SKETCHES IN THE 



LETTERS. 



PAGE 



Figure i. Hypothetical Section illustrating Conti- 

 nental Elevation 123 



„ 2. Diagram of Junction between Dike and Lava 129 



„ 3. Outline of an Elliptic Crater . . .129 



„ 4. Hypothetical Section showing the Relation 



of Dikes to Volcanic Vents . . .130 



„ 5. Map illustrating the Linear Arrangement 

 of Volcanic Islands in relation to Con- 

 tinental Coast-lines 143 



„ 6. Sketch showing the Form and Distribution 



of Quartz in a Foliated Rock . . . 207 



7. Sketch showing the Arrangement of Felspar 



and Quartz in a Metamorphic Series . 208 



„ 8. Floral Diagram of an Orchid .... 274 



„ 9. Dissected Flower of Habenaria Chlorantha . 277 



„ 10. Diagram of a Cruciferous Flower . . . 286 



„ 11. Longitudinal Section of a Cruciferous 



Flower 287 



„ 12. Transverse Section of the Ovary of a 



Crucifer 289 



„ 13.* LEAF OF Trifolium resupinatum .... 412 

 (Drawn by Miss Pertz.) 



* Not a facsimile. 



Vlll 



