Jim Lewis wrote:

Hi Jim
It doesn't. The sap runs up "tubes" in the outer parts of the woody
section of a stem -- the Xylem -- pulled by the transpiration of water
from the leaves.

The cambium layer -- usually much less than a mm thick -- is the live
cells that make the tree grow larger. It grows in both directions,
making bark on one side and sapwood on the other.
ok .. what is making me perplex is the difference of the
bark in younger branches , half inch size where you can
feel the tender under your nail , and the base of the
trunk that is about 3 "and a part is decayed, I cannot see
exctly , where the sap is going from roots ,as all looks so
dryed out .. Roots are located only in one side as the
tree was a branch that spontaneously layered as touching
the soil .
I think I will leave the juniper root well first ,and
if survives with time will find
out where is exactly this live bark, and where
I can cut it away to make a jin.
When you see Juniper bonsais with jin the redwood wein
looks so thick, like a cord , that makes me perplex how to
make the same on my tree


Thanks for the links I 'll have a look again as is
always useful to read things over and over again ...

See: http://www.enchantedlearning.com/sub...bel/labeltree/

for the very basic of basics of tree anatomy.
Tiziano