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Examples of Carbonaceou
The most forcible objection to allowing the air to escape through the ceiling is that it is a wanton waste, not only of heat, but of the fresh air that has just come from the north pole by way of the furnace and cold-air box, and which, by virtue of its warmth, goes in all its purity straight to the ceiling.
We know, too, how quickly the sulphurous gas that sometimes escapes from those warranted furnaces not only ascends through the tin pipes, but rises in the open stairway if it has a chance.
In the fresh-water portion of the same beds Paludina lenta (Figure 163) occurs; a shell identified by some conchologists with a species now living, Paludina unicolor; also several species of Lymneus, Planorbis, and Unio. 3.
The next series, or middle fresh-water and estuary marls, are distinguished by the presence of Melania fasciata, Paludina lenta, and clays with Cypris; the lowest bed contains Cyrena semistriata (Figure 159), mingled with Cerithia and a panopaea.
This bed contains a mixture of Hempstead shells with those of the underlying Upper Eocene or Bembridge series.
Melania costata, Sowerby, Melanopsis, etc.