the columns: corregated cardboard vs paper towels
Posted by Catherine Cartwright Jones on July 4, 2001 at 15:14:12:
In reply to: The columnar structure of skin cells keeps them separate posted by Catherine Cartwright Jones on July 4, 2001 at 02:17:04:
If this is tricky to visualize ....the thin top epidermal layer, where henna goes ... is more like
corregated cardbord than a roll of paper towels in structure. If you
put a drop of ink on corregated cardboard, it would mostly drip down
the vertical column, as opposed to spreading out. If you put a drop
of ink on a roll of paper towels ... which have less structure, and
horizontal layering ... it diffuses.
So ... that's why the side-by's are valid.
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