text:  And if you wonder how such Chaldaic and Egyptian lore should come into your tale of chivalry you will be relieved by understanding that these dedications had in our poetical ages due popularity for infusing into them a poetical efficiency; forasmuch as an old French "Shepherds' Calendar " cited by Tyrwhitt alleges the very rule which we have given for the instruction of him "who will weet how the Shepherds do wit which planet reigneth every hour of the day and of the night