138 Immigrant Plants in Los Angeles County, Cat. 



This mine also contains a considerable amount of native mercury, 

 usually in fine particles disseminated throughout the various rocks. 



The Elk Head mines are situated thirteen miles north from 

 Bonanza, and differ from the others in having the trap, which in 

 this case is amygdaloid, usually containing natrolite crystals and 

 other zeolites on the west, and the sandstone in large areas on the 

 east. The dip is slightly to the east or southeast. A few fine spec- 

 imens have been taken from this mine, but the ore, though a splendid 

 working ore from its large vein of soft tufa being easily worked, is not 

 noted for fine specimens. 



Somewhat to the south of this mine, cinnabar has been found 

 directly in the trap rock without any apparent vein, but no large 

 amount. All three of these mines agree in having large mountains 

 of volcanic tufa or ocherous rock on the north, all of which usually 

 contains a little cinnabar. 



A small deposit of cinnabar ore in the southwestern part of 

 Douglass county on the divide between the southern head waters of 

 the Looking Glass creek, and those of Cow creek, eight miles west of 

 Riddle, differs from the foregoing in having a large deposit of ser- 

 pentine on the east, taking the place of the traps in the other mines. 



Deposits of granite in the serpentine are a leading feature of this 

 locality. All the foregoing agree in having the contiguous sand- 

 stones much metamorphosed. 



The former three are in formations supposed to be not older than 

 Eocene, probably lower Eocene, but the latter is thought to be much 

 older, and not later than lower cretaceous, as some fine fern leaf im- 

 pressions in the adjacent shale have been on good authority, pro- 

 nounced carboniferous. I have now a number of these specimens 

 among my collections. 



Small deposits of cinnabar have been found in Baker and Jose- 

 phine counties, but I am not aware of any other deposits of note. 



Aurelius Todd. 



IMMIGRANT PLANTS IN LOS ANGELES COUNTY, 



CALIFORNIA. 



To the European visiting California it is cheering to find that 

 though 6000 miles from home some of the flowers so familiar to him 

 in the old country still greet him here. Under such varied condi- 

 tions of soil and climate, these Old World immigrants have consid- 

 erably changed; some, like the genus homo, have been improved 

 racially and individually, while others, under the same conditions, 

 have shown little increase, or have even depreciated. 



Certain immigrant plants are so identified with the invasion of 

 the Anglo Saxon race that their presence may be considered a proof 

 of commencing colonization. 'Twas the constant association of 

 Plantago major, the broad-leaved plantain, with the homes of the 



