OF MONTE SOMMA AND VESUVIUS. 119 
PuasE VII., Periods 2, 3, 4, 5, 6, and 
Puass VIII. Ashy soil, pisolitie at bottom and cultivated on the sur- 
PCO. cic esis oat oe RESP RCEE  Oste ns wisizclnieale siscisiais'e a's Woisjistol 5:20 
SECTION 12. Streets of Pompeii. Section taken just beyond the Vico dei Duo- 
dici Dei, in the Strada di Abondanza. 
PuaseE I. Lava? , 
Streets of Pompeii with their pavements. metres. 
Puase VII, Period 1. Plinian pumice, the lower third more vitreous 
and whiter; the upper two thirds more 
compact and microcrystalline, with greater 
abundance of ejected foreign blocks............ ‘50 
Pisolitie ash - 2. .2.s cere es seawater ose. 0:10 
Leucilitic lapilli, and compact greenish pumice 0°10 
Pisoliticiash 1. 2p eaesancaseetere tteconseae oases. 0-60 
Leucilitic lapilli, and compact greenish pumice 0-10 
Periods 2, 3, 4, 5, 6 and 
PuaseE VIII. Pisolitic ash passing up into vegetable soil ............... 2-00 
