a dark, tough volcanic
rock occurring in lava
flows. Used figuratively in this lecture.
a dark, tough volcanic
rock occurring in lava
flows. Used figuratively in this lecture. What we put in now goes in in concrete and basalt, particularly the
preclears.
-How We Have Addressed the Problem of the Mind (4 July 1957) a
hard, dense, dark-
colored rock of volcanic
origin. Used figuratively in the lecture to make a
point.