-on sphaerulites.
seale, mr., geognosy of st.helena.
-on dikes.
-on embedded birds' bones.
seale, on extinct shells of st.helena.
sedgwick, professor, on concretions.
septaria, in concretions in tuff.
serpulae on upraised rocks.
seychelles.
shells, colour of, affected by light.
-from van diemen's land.
-land, extinct, at st.helena.
-particles of, drifted by the wind at st.helena.
shelly matter deposited by the waves.
siau, m., on ripples.
signal post hill.
silica, deposited by steam.
-large proportion of, in obsidian.
-specific gravity of.
siliceous sinter.
smith, dr.a., on junction of granite and clay-slate.
spallanzani on decomposed trachyte.
specific gravity of recent calcareous rocks and of limestone.
-of lavas.
sphaerulites in glass and in silicified wood.
-in obsidian.
sowerby, mr.g.b., on fossil-shells from van diemen's land.
-from st.jago.
-land-shells from st.helena.
st.helena.
-crater of elevation of.
st.jago, crater of elevation of.
-effects of calcareous matter on lava.
st.paul's rocks.
stokes, mr., collections of sphaerulites and of obsidians.
stony-top, little.
-great.
stratification of sandstone in new south wales.
streams of obsidian.