150 Jounston-Lavis—The Eruption of Vesuvius in April, 1906. 
materials away in the opposite direction. During the day heavy clouds of sand 
and dust fell over that sector of the mountain between Portici and Torre del 
Greco. So dense was this cloud that the darkness was compared to that of a 
tunnel. The base of this sector would measure from 3 to 4 kilometres at the line 
of the coast. Fine dust was still falling over Ottajano and that district during 
the whole day. 
April 10th—The ejection of fine lapilli around the cone, with sand and dust 
at greater distances, continued, but the fairly strong N. HE. and N.N.E. winds 
carried most of it over the towns and sea to the south-west of the volcano. 
A good deal of the components of the dust-clouds was still being ejected, but 
much of the dust in the atmosphere was produced by the slipping down of loose 
materials on the surface of the cone. 
On the 10th it was possible for the first time to see the great masses that had 
not only slipped off the cone that had been deposited on its slopes by the eruption, 
but also the great scars over the lateral outburst of the 4th, 5th, and 6th April, on 
the south flank of the cone, between the lava buttresses of 1883 and 1885. 
These slips continued without intermission for days; and when I visited the 
voleano on April 26th, they were still in progress, but by that date the most 
unstable collections had been dislodged. 
By the afternoon of this day, the 10th, the great lava-stream of Boscotrecase- 
Torre Annunziata had completely stopped, though that towards Terzigno was still 
showing a little movement. 
Strangely enough, about midnight, one of the Bosco Cognoli mouths emitted 
some fresh lava, that flowed over the earlier streams for some distance towards 
Bosco. 
April 11th and 12th.—The dust of the 8th, 9th, and 10th always maintained a 
reddish colour, most comparable to that of cocoa. On the 11th there were fairly 
strong explosions at rather long intervals. Early in the forenoon there was a 
good deal of terrestrial movement recorded by the seismic apparatus at the 
Observatory. Towards evening Naples was at last delivered from falling dust, 
as were likewise Portici, Torre del Greco, and Torre Annunziata. 
April 14th.—A shower of grey dust, some centimetres in depth, fell at San 
Giuseppe and Ottajano. Falls of dust were also recorded at Collina, Strocchia, 
Boscoreale, and Somma. A slight earthquake was felt at Ottajano and Terzigno. 
April 15th.—At 2 p.m. a heavy shower of dust began falling at Ottajano, 
Boscoreale, Boscotrecase, and Torre del Greco, causing intense darkness. Some 
dust fell at Portici, Resina, San Sebastiano, and San Giorgio. 
