and salt on threshold, [21];
at entrance to cave or tent, in primitive times, [22] f.;
on threshold altar in China, [39];
and blood, significance of, [40];
reference to, [41] f.;
references to, [54]-56, [158];
masculine symbol, [198];
production of sacred, [198];
doorway, origin of, [226];
as gift of God, [227].