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==de Villiers==
<span id="Pama"><i>Also called the '''Pama''' numbering system</i><span>
A descendant numbering numbering system that assigns letters to generations, and then appends family subgroup birth order numbers. Generations are separated by a decimal point.
Developed by Christoffel Coetzee de Villiers <small>1850-1887</small> for use in the 1894 posthumous ''[https://books.google.com/books/about/Geslacht_Register_Der_Oude_Kaapsche_Fami.html?id=GcbxMgEACAAJ Geslachtregister der Oude Kaapsche Familien]''. Refined by Dr. Cornelis "Cor" Pama <small>1916-1994</small> for the 1966 translation, [https://www.worldcat.org/title/genealogies-of-old-south-african-families-geslagsregisters-van-die-ou-kaapse-families/oclc/866676811 ''Genealogies of Old Cape Families''.]
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==Henry==
[[File:HenrySystem1935.png|thumb|right|300px|Fig. {{#var:chapter}}.{{#vardefineecho:figure|{{#expr:{{#var:figure}}+1}}}} Numbering System example from R.B.Henry's ©1935 book]]The <span id="henry">Henry System</span> is a descending system created by Reginald Buchanan Henry (1881-1969) created a numbering system assigning a number for his 1935 book, <i>[https://catalog.hathitrust.org/Record/005802323 Genealogies of the Families of the Presidents.]</i> In the Henry System, each President was a Progenitor and restated the list with and index number equal to their birth order. The progenitor's offspring is Generation 2 and appends a birth order digit to the index in the 2nd place. If there are more than 9 children, the tenth child is given the letter 'X' and the eleventh starts alphabetical letters A through V. So a 4 digit index of '''64X3''' would be a child of the fourth generation. That descendant would be described as the 3rd child of the 10th child of the 4th child of the progenitor. And the progenitor was 6th born in their family.
