This marginal note seems to belong to the point about the honour given to the oak made at the end of the paragraph - Pliny, Natural History IV, trans. H. Rackham (Loeb, 1952), 548-51 (Book XVI, 95): `The Druids - that is what they call their magicians - hold nothing more sacred than mistletoe and a tree on which it is growing, provided that it is a hard-oak. Groves of hard-oaks are chosen even for theior own sake, and the magicians perform no rites without using the foliage of those trees ...'.