9. The letters are datelined, for example, “
Ashley Combe Monday 8 Nov”, always without a year. The paper used often has a year in its watermark, thus giving a lower bound. In some cases the year can be inferred from internal evidence: this example contains a reference to a son born to Mrs. De Morgan, and this son must be George Campbell De Morgan, who was born on 16 October
1841. His elder brother, William Frend De Morgan, was born on 16 November
1839. In fact 8 November 1841 was a Monday.
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