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POPULAR SCIENCE REVIEW. 
isle — slowly tracks its way^ and silently marks Timers passage 
kour by hour. Into its eastern side a huge deep gash has 
been cut_, so Lyell says^ by the sea, and in the sands of the shore 
of Giarre, he sees sediments formed of the clehris of those 
courses of lava-streams and over-covering layers of ashes that 
once, during unreckonable ages, were piled where the deep 
Yal del Bove now exists. 
In the structure of the mountain everything is vast. The 
lava-streams of Yesuvius are incomparable mth its coulees — 
Fig. 2 . — Plan of the Elevated Kegions op Etna. 
A, the Crater ; X, Platform of old Crater. The dates I 8 O 9 , 1792, &c,, indicate the mam sites of 
the lavas of those respective dates. The black spots indicate various lateral craters of 
eruption. The directions of the following: principal towns are indicated by the arrows; 
the distances added are reckoned from the points of the arrows. * C de C, Castiglione, 
5 miles ; the site whence the View in Plate XVIIf. was taken. Mojo, 5 miles. RAN, 
Randazzo, 4^ miles. L, Linguagrossa, 2 miles. P, Piedimonte, 3 miles. (Annunziata is 
3 miles to the south of this.)* R, Riposto, 4^ miles. T d’ A, Torre d’ Archirafi, 6 miles. 
A R, Aci- Reale, 7 miles. A C, Aci-Castello, 10 miles. To Catania, 14 miles; and on the 
same line is Nicolosi, 5 miles. To Aderno, 4^ miles. B R, Bronte, 4 miles. S. d. C, 
Serra delle Concazze. S. d. S, Serra de Solfizio. F, Monte Frumento. C, Monte 
Concone. B, Monte Barracca. M C, Monti delle Concazze. M M, the “ Two Moun- 
tains.’’ C R, Monte Crisimo. S T, Monte Stornello. S B, Serra Buffa. 
often 15 to 20 miles in length by 4 or 5 miles in breadth, and 
50 to 100 feet in thickness. These lava-streams do not 
