358 Prof. Ehrenberg on the Microscopic Life 
2. Stone from the hot spring, coated with calcareous incrusta- 
tions and Oscillatorie. No.167.—I have received two breccia- 
like, coarsely granular, but not porous specimens of stone, 
nearly 2 inches in diameter, exhibiting, in a black fundamental 
mass, white amorphous grains, often 1 line in diameter, and 
sometimes separable, which are glassy at their margins, but 
mostly opake in the middle. The spring has a temperature of 
131° F., a somewhat alkaline reaction, and a strongly mimeral 
taste. At high water it is covered by the sea. The specimens 
have formed the walls of a natural supply-pipe. Muriatic acid 
dissolves a portion of the incrusting coat with effervescence ; a 
considerable portion remains unaltered. Of the latter a portion 
is felt-like, and composed of very delieate organic elements ; an- 
other portion is earthy. The felty masses are partly of a green 
colour (they were living), partly colourless or white (dead ?). 
The green portions are entirely felted Oscillatoria, one of which 
(a very fine one) closely resembles O. labyrinthiformis ; the other, 
which is rather coarser, is of a more vivid green. The pale- 
yellowish and white felted masses are made up of the same forms 
bleached, but also frequently of dense colonies of hitherto un- 
known forms (Phalarina Wiillerstorfii, Cymboplea Novare, Collo- 
sigma Scherzeri, and Collorhaphis Sellenyi), amongst which various 
other forms lie isolatedly. The total result of twenty analyses 
enables us to: register, besides the Oscillatorie, 14 Polygastria, 
4 Phytolitharia (of which 3 are Spongolithes) and 1 Lepido- 
pterous scale. The new genera are mostly amorphous jellies, in 
which scattered and densely aggregated Naviculacea lie without 
order. 
3. Cinder from the coast, covered with Serpule. X.—The frag- 
ment of cinder, rather more than 2 inches in diameter, is very 
porous, with the principal mass dark brown; it resembles a 
firmly cemented dark-brown sand, and has white enclosed grains, 
glassy at the margin, and not acted upon by acids, like those in 
No.2. The Serpule are mostly covered with a thin green coat 
of Alge. The fragment, previously freed from all foreign dust 
by strong blowing on all sides, was repeatedly shaken strongly, 
in a suitable vessel, with distilled water, by which a slight tur- 
bidity of the water was produced. In the deposit there were, 
in twenty analyses, 42 organic forms : —viz. 12 Polygastria, 
12 Phytolitharia, 14 Polythalamia, 2 Polyeystina, 1 Bryozoon, 
1 Zoolitharion. 
4. Coarse black sand from the shore. No. 154.—The sand 
resembles coarse gunpowder, and only contains a few whitish 
silicious particles. Many of the black grains follow the magnet, 
and appear to be a magnetic iron-sand. There were no organic 
forms. 
