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Bark , the tree 's primary barrier which protects the inner woody cells has to regrow over the exposed sapwood tissue reducing the rotting process to a minimum and also acts as an impermeable barrier against water loss , without which the tree would eventually dehydrate and die off . Note that the holes in the outer sleeve should line up with the holes in the inner tube ( even though it does n't quite look like it in the photo ) , so that any ant may walk from the soil , through the outer sleeve , and into the inner tube . The earliest known use of brick in Glamorgan is in the inner facing of the porch , the surface of which is grooved to simulate rustication . In fact , when the system is detached the pulsar radio emission is not quenched , and may be able to prevent further mass accretion due to the action of the pulsar pressure at the inner Lagrangian point . They have seen people die blind because of the so-called retinitis that affects the inner aspect of the eye .