FACSIMILES OF SKETCHES IN THE 



LETTERS. 



PAGE 



FIGURE i. HYPOTHETICAL SECTION ILLUSTRATING CONTI- 

 NENTAL ELEVATION 123 



35 



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 



ii. LONGITUDINAL SECTION OF A CRUCIFEROUS 



FLOWER 287 



12. TRANSVERSE SECTION OF THE OVARY OF A 



CRUCIFER 289 



55 



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

 (Drawn by Miss PERTZ.) 



* Not a facsimile. 



via 



