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The Henry numbering system is a way of numbering descendants of a person. It is named after Reginald Buchanan Henry, who used the system in his book

The Henry numbering system is available on the Descendant Narrative book report and the Descendant Chart report.

The starting person is given the number 1. His first child is numbered 11, his second child is 12, his third child is 13, etc. The children of 12 are 121, 122, 123, 124, 125, etc. Each person's number starts with his parent's number and adds a digit to represent his position in the family. Thus if a person has the number 142835, he is in the sixth generation (there are six digits), and he is the fifth child of the third child of the eighth child of the second child of the fourth child of the starting person.

If there are more than 9 children in a family the numbering continues on with capital letters in the alphabet, A to Z, where A is 10, B is 11, C is 12, etc.

The Henry system is a simple way to trace generations back and forth when perusing a manuscript, for the Henry number of any person's ancestors or descendants is known. Furthermore, lines can be extended without renumbering when new information is found. Indexing a manuscript is a simple matter - page numbers are not required, as Henry numbers are sufficient to locate any person.

See also de Villiers/Pama numbering system.

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