Ia. The Cone of Vesuvius, in 1870, from a Photograph taken
near the Observatory.
_a._ The Atria del Cavallo.
_b b._ Fossa della Vetrana.
_c._ Punta del Crocella.
_d._ Lava of 1858 and 1867.
_e._ Police Barrack near the Observatory.
_f._ Part of Monte Somma.
IIa. Profile of Vesuvius, taken from a Photograph of the
Observatory in the month of September, 1871.
1. The Cone, on the 13th January, 1871.
2, 2. Lava of 1871.
IIIa. Profile of Vesuvius on the 16th April, 1872, about ten
days before the last Conflagration.
IVa. Vesuvius, on the 26th April, 1872, from a Photograph taken
in the neighbourhood of Naples.
1. The Observatory.
2. Fossa della Vetrana.
3. Eruption of Smoke and Ashes, with Stones, from the
surface of the Lava.
4. The Novelle, St. Sebastiano, and Massa.
5. Lava which took the direction of Resina.
6. Lava which, from the Crater, took the direction of the
Camaldoli.
7. The Grain Stores, near Naples.
8. Resina.
9. Torre del Greco.
10. The Camaldoli.
Va. Profile of Vesuvius after the Eruption of the 26th April,
1872, from a Photograph taken near the Observatory.
1, 1. The Fissures of the 26th of April.
2, 3. Small Hill thrown up on the morning of the 26th of
April, from below which issued the great current of
Lava.
4, 4, 4. The Mouths out of which the Lava issued.
5, 5. The larger Lava Stream, which passed near the Observatory
by the Fossa della Vetrana.
6, 6. The other Lava Stream, which, after dividing from
the last, took the direction of Resina.
7, 7. The Lava which ran down towards the Camaldoli.
8 & 9. The two Craters on the summit of the Cone.
VIa. The Bifilar Electrometer of Signor Palmieri.
(_Details._)
VIIa. The assemblage of the Electroscopic Apparatus of Signor
Palmieri, as arranged at the Vesuvian Observatory.