Analysis of the records of 1000 oestrous cycles in the normal unmated mouse give the following results:

Mean length of whole cycle = 6.213 ± 0.0554 days.

Mean length of dioestrus (including meta-oestrus) = 3.719 ± 0.0502 days.

Mean length of oestrus (including pro-oestrus) = 2.494 ± 0.0223 days.

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