ON THE ROCKS OP THE HAURAKI GOLD-FIELDS. 273 



to the first set of changes, it would exist chiefly as auriferous 

 pyrites ; while in the softer " kindly sandstone " more gold would 

 be added in auriferous quartz without pyrites. 



These are however surmises, which 1 am not in a position to 

 test, and are intended merely to direct the steps of other investi- 

 gators. I nmst however add that if my views are correct, it will 

 be useless to follow the reefs far down into the slates. This con- 

 clusion is, I am aware, opposed to the opinions of Sir James 

 Hector and Mr. Cox,* and I can only say that I hope time may 

 prove me to be wrong. 



BIBLIOGRAPHY. 



1. Heaphy. Quart. Journ. Geol. Soc. Vol. X. (1854), p. 311. On 



the Coromandel Gold-diggings, New Zealand. 



2. „ Quart. Journ. Geol. Soc. Vol. XL (1855), p. 31. 



Gold-bearing District of Coromandel 

 Harbour, New Zealand. 



3. Hochstetter. N.Z. Gov. Gazette, No. 2, Utli July, 1859. 



Lecture on the Geology of the Province of 

 Auckland ; also in Geology of New Zealand, 

 pp. 14 and 51, Auckland, 1864. 



4. Lauder Lindsay. Proc. Geol. Section, Brit. Association, 1862. 



On the Geology of the Gold-fields of Auck- 

 land, N.Z. 



5. Hochstetter. Reise der Novara, Geologischer Theil, I. Band., 



p. 24. Wien, 1864. 



6. „ New Zealand, p. 94. Stuttgai% 1867. 



7. Hector. Report on Thames Gold-fields, 1867, p. 2. Li- 



structions to Captain Hutton, relative to the 

 Thames Goldhelds. 



8. Hutton. Geological Reports, 1867, p. 8. Geology of the 



Thames Gold-fields. 



9. Hector. Progress Report Geol. Survey, 1866-7, p. 32. 



10. „ Trans. N.Z. Institute, Vol. L p. 45. Gold from 



. pyritous rocks at the Thames. 



11. Mackay. Appendix to Journ. House of Repres. 1869. 



Report on Thames Gold-fields. 

 12 Hector. Progress Report, 1868-9, p. viii. Comparison 

 between Coromandel and Longwood. 



13. Hutton. Geological Reports, 1868-9, p. 15. Second Report 



on Thames Gold-fields. 



14. Hector. Geological Repoi'ts, 1868-9, p. 39. Notes on Capt. 



Hutton's specimens. 



15. „ Trans. N.Z. Institute, Vol. II. p. 367. Mining in 



New Zealand. 



16. Skey. Report Museum and Lab. No. 5, 1870, p. 11. 



Percentage of water in Quartz. 



♦Reports, Geological Explorations, 1882, pp. xv. and 45. 



