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453F
Semmering
22 August 1924
Dear Friend,
Ad vocem1: 7.
I am putting at your disposal an idea the value of which I cannot judge myself because of ignorance.
I should like to take a historical view and believe that the significance of the number 7 originated in a period when people had a system of counting in sixes. (Here ignorance sets in.) Then 7 was not the last of a series as it is now, in the week, but the first of a second series and, like all beginnings, subject to taboo. The fact that the initial number of the