/bin/ls -C Question

[Mark E. Sunderlin]

Ok, here is my question to the net.  Why does ls -C Sometimes
NOT print across the screen?  Most of the time when I enter
a ls -C I get a nice diretory like:
News    fvps.c  h19     mbox    vps.c
But some times a directory will list one per line on me.  What does
ls make this decision on?  I have seen this behavior on both at&t 3b2
machines and on Tandy 6000 machines. (sys V on one Xenix 3 on the latter)
Any thoughts???
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