|l6 LIST OF ILLUSTRATIONS. 



PLATE VIII. 

 Hills of granite near Erinpura Road Station, Rajputana-Malwa Railway. 



PLATE IX. 

 Fig. I. Quartz phenocryst corroded by Magma. Ordinary light. 

 Fig. 2. Quartz phenocryst corroded along Zonal lines. Ordinary light. 

 Fig. 3. Phenocryst of quartz, partially remelted and drawn out along lines 



of flow. Ordinary light. 

 P'S- 4- Quartz phenocryst surrounded by irregular "court" of secondary 



quartz. Nicols crossed. 

 Fig. 5. Quartz phenocryst surrounded by concentric "court" of secondary 



quartz. Nicols crossed. 

 Fig. 6. " Court " surrounding quartz grain, showing details of secondary 



growth. Nicols crossed. 



PLATE X. 

 Fig. 1. Felspar phenocryst formed of interpenetrating individuals. Nicols 



crossed. 

 Fig. 2. Micropegmatitic phenocryst of quartz and felspar. Ordinary light. 

 Fig. 3. Flow-stucture. Ordinary light. 

 Fig. 4. The same, more highly magnified, showing sphserulitic arrangement 



of hornblende needles. Ordinary light. 

 Fig. 5. Flow and perlitic structures. Ordinary light. 

 Fig. 6. Perlitic structure. Ordinary light. 



PLATE XI. 

 Fig 1. Perlitic structure. Ordinary light. 

 Fig. 2. The same, more highly magnified, showing minute sphairulites. 



Ordinary light. 

 Fig. 3. Sphserulitic structure. Ordinary light. 

 Fig. 4. Breccia formed of glass chips imbedded in lava, showing devitrified 



condition of fragments. Ordinary light. 

 Fig. 5. One of the fragments in Fig. 4. More highly magnified, showing 



details of devitrified structure. Ordinary light. 

 Fig. 6. Contact between granite and rhyolite, showing- development of 



hornblende at junction. Ordinarv light. 



