Smithsonian Report, 1909.—Johnston-Lavis. PLATE 3. 
Phase VIT, period 1, Pompeii eruption 
of a.p. 79, to illustrate same 
difference as last Plate. 
Dr. H. J. Johnston-Lavis mierephot. 
PUMICES AND PUMICEOUS SCORIA FROM EXPLOSIVE ERUPTIONS, MONTE SOMMA AND VESUVIUS. 
