San Francisco, March 6th, 1866. 



I. N. HoAG, Esq., 



Secretary of the State Board of Agriculture : 



Dear Sir: — I send 3-ou for your report a list, with notes, of the prin- 

 cipal minerals and mineral localities of the State, and of portions of the 

 adjoining States and Territories. It was my intention to make tins list 

 comjilete before publication, but the time at my disposal since the Board 

 honored nie with the appointment has been so limited that 1 am com- 

 pelled to send it to you conscious of many omissions and imperfections, 

 which I hope to remedy in the future. This list is not designed to be of 

 very direct economical value, but is intended rather to show the nature 

 and distribution of our minerals, and to help to arouse an interest in the 

 science of mineralogy among our people. 



Yery respectfully, your obedient servant, 



W. P. BLAKE, 



Geoloo'ist of the Board. 



