Its vapour is spontaneously inflammable when exposed to air.
The soldiers, swinging their arms and keeping time spontaneously, marched with long steps.
Monoclinic sulphur, obtained by crystallizing fused sulphur, melts at I 19.5°, and admits of undercooling even to ordinary temperatures, but contact with a fragment of the rhombic modification spontaneously brings about the transformation.
In 1876 this policy revived as a matter of course in the cabinet, and as spontaneously, though not upon a first provocation, became popular almost to fury.
We must have willed thus spontaneously first, otherwise we could not know, before our reflective volition, that we could will and act.