442 



FIEST TEAR SCIENCE 



stones and porous blocks of rock which resemble the slag 

 of a blast furnace. The small fragments in such erup- 

 tions are called ash or cinders. In a week the eruption 

 was over, and nothing of the kind has since occurred in 

 the region. 



When visited by the writer a few years ago, the bottom 

 of the crater was a level field planted to corn. The whole 

 process of formation of this volcanic cone was observed 

 and recorded by residents of the region. Other similar 

 eruptions have been observed, but perhaps this is the best 

 known. We have here what may well be called a young 

 volcano. The cone to-day is almost perfect in form. 



-- wT 



L' >^:'f^--,*S$^ 



r \- ' J&awfi*--,. *r?l 



"^v>^y J 4.^^^ 



ClNDEB CONE NEAR MOUNT L.ASSEN. 



In northern California, near Mt. Lassen, which has itself 

 recently become active, another almost perfect cone of this 

 kind is found, which was probably formed much more re- 

 cently than Monte Nuovo. From this cone both cinders 

 and liquid material or lava were ejected. 



