The probability that the suggestions made in the following pages are at least in part correct is enhanced by the circumstance that they deal not with major ideas where independent origin in different places and 'mental climate' are complicating factors but with small and secondary details, mainly of a philological nature. Since the latter are in many cases firmly anchored in a definite literary background, they can have been borrowed only by direct contact. They concern such matters as are admitted to be borrowed, even in the view of those scholars who believe Muhammad's religious ideas to have been largely original.3