Now let us march: march!" He had better have said slide, for we did nothing but drop down the steep inclines.

It was the facifs _descensus Averni_ of Virgil.

The compass, which I consulted frequently, gave our direction as south-east with inflexible steadiness.

This lava stream deviated neither to the right nor to the left.
Yet there was no sensible increase of temperature.

This justified Davy's theory, and more than once I consulted the thermometer with surprise.