Smithsonian Report, 1909.—Johnston-Lavis. PLATE 2. 
Phase TIT, Monte Somima, showing vast 
difference between the pumice eyected 
at the commencement and middle cof 
un explosive eruption. 
Dro UT. Johuston-Laris mierophat 
PUMICES AND PUMICEQOUS SCORIA FROM EXPLOSIVE ERUPTIONS, MONTE SOMMA AND VESUVIUS. 
