According to one theory, Shakespeare's main source is an earlier play—now lost—known today as the Ur-Hamlet . Possibly written by Thomas Kyd or even William Shakespeare, the Ur-Hamlet would have existed by 1589, and would have incorporated a ghost.  Shakespeare's company, the Chamberlain's Men , may have purchased that play and performed a version for some time, which Shakespeare reworked.  However, since no copy of the Ur-Hamlet has survived, it is impossible to compare its language and style with the known works of any of its putative authors. Consequently, there is no direct evidence that Kyd wrote it, nor any evidence that the play was not an early version of Hamlet by Shakespeare himself. This latter idea—placing Hamlet far earlier than the generally accepted date, with a much longer period of development—has attracted some support. [b]
Hendiadys is one rhetorical type found in several places in the play, as in Ophelia's speech after the nunnery scene ("Th'expectancy and rose of the fair state" and "I, of all ladies, most deject and wretched" are two examples). Many scholars have found it odd that Shakespeare would, seemingly arbitrarily, use this rhetorical form throughout the play. Hamlet was written later in his life, when he was better at matching rhetorical figures with the characters and the plot than early in his career. Wright, however, has proposed that hendiadys is used to heighten the sense of duality in the play. 
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As the evidence against cocaine became irrefutable, and his fame grew, Freud quit coke and destroyed the letters and documents that discussed his affair with it. He provided little evidence as to what exactly instigated his sobriety. David Cohen, author of Freud on Coke , suggests he may not have needed the drug anymore, as he had solidified his reputation following The Interpretation of Dreams . He accepted the evils of cocaine, and no longer needed it personally. “I know very well how [the cocaine episode] happened to me,” he wrote his friend and biographer, Fritz Wittels, in an attempt to remove all biographical discussion of his cocaine use. “The study on coca was an allotrion [a distracting, futile pursuit] which I was eager to conclude.”