In the first case the action of the hydathode should continue even after the treatment with the sublimate solution, while in the latter case it should not.    From Wordnik.com.  [At the Deathbed of Darwinism A Series of Papers] Reference

Even if the hydathode is treated with sublimate solution, all the conditions for mechanical filtration still remain: the earth has moisture which can be taken up by the roots so that root-pressure still exists.    From Wordnik.com.  [At the Deathbed of Darwinism A Series of Papers] Reference

The water which is forced upward by the root-pressure of the plant is naturally conveyed through the vascular fibres into the leaves and at every hydathode the superfluous water oozes out in drops, a phenomenon which one can also very nicely observe e.g. on the "Lady's cloak" (Alchemilla vulgaris) of the German flora.    From Wordnik.com.  [At the Deathbed of Darwinism A Series of Papers] Reference

But it does destroy it, and the hydathode dies.    From Wordnik.com.  [At the Deathbed of Darwinism A Series of Papers] Reference