Physiologus (‘the Natural Scientist’), an exposition of the marvellous properties of some 50 animals, plants, and stones, with a Christian interpretation of each (e.g. the pelican, which kills its offspring then revives them after three days with its own blood, figures the salvation of mankind through the Crucifixion). Both place and date of composition are disputed: perhaps Syria, perhaps Egypt; perhaps as late as the 4th cent.