ILLUSTRATIONS. 



Page. 



Plate I. Distribution of quicksilver mines in California Frontispiece 



II. Distribution of quicksilver deposits tbrousbont tlie world 15 



III. European and other foreign forms of J»rf//a 231 



IV. American forms of J ucella -'■'~ 



V. Geological map of Oathill 354 



VI. Geological m.ap of tbe Great Western district 3.^8 



VII. Map of tbe Great Eastern district 362 



Fig. 1. Zoisite microti tes ''^ 



•i. Autbigenetic augite in altered sandstone 88 



3. Autbigenetic borublendo in altered sandstone 89 



4. Clastic quartz p.artially converted to serpentine 123 



5. Ruptures produced by compression of strata 236 



6. Dendritic sinter on tbe shore of Borax L.ake 266 



7. Partly metamorphosed anticlinal 276 



8. Sandstone undergoing serpentinization — 277 



9. Serpentine forming from sandstone 2/8 



10. Di.agraram.atic vertical cross-section of tbe Reding ton mine -'.. 289 



11. Contact between metamorphic rocks and Chico beds 296 



12. Sketch of New Idria ore bodies 303 



13. Fissures of the New Alm.adeu district 329 



14. Vertical cross-section of the Napa Consolidated mine 3r)7 



15. Vertical cross section of the Great Western mine 360 



16. Vertical longitudinal section of tbe Great Western mine 361 



17. Vertical cross-section of the Great Eastern mine 364 



18. Geological sketch map of tbe Mayacmas Range 369 



19. Linked veins 410 



20. Simple fl.ssure vein and chambered vein 411 



