This action failed, however. It was probably Osiander who was also behind the insertion on the title page of the warning: 'Let no one untrained in geometry enter here', a phrase reputed to have been inscribed above the entrance to Plato's Academy. The printing of On the Revolutions was completed in 1543 shortly before the author's death in May of that year.

Probably about 4-500 copies were printed originally, of which the whereabouts of as many as 250 are known today! Rheticus' copy is one of the known ones and contains a poem (in Greek) on the flyleaf, hand written by its author Joachim Camerarius from Leipzig. The poem describes the following conver-

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