Louis' Mixed Drinks with Hints for the Care & Serving of Wines by Louis Muckensturm (1906, p.102)

0.5 bar-glassJamaica rum base
1 teaspoonfulsugar — Sugarbase
milk — Hot milkdilution
1 unitegg — Raw eggother
  1. Shake well, strain into a hot whiskey-glass, fill with hot milk, grate nutmeg on top, and serve.

Garnish: Grated nutmeg

Bartenders' Guide: How to Mix Drinks by Wehman Bros. (1912, p.34)

1 wine-glassJamaica rum base
1 teaspoonsugar — Sugarbase
water — Hot waterdilution
1 wholeegg yolk — Egg yolkother
nutmeg — Nutmegother
  1. Dissolve the sugar in a little hot water, add the Jamaica rum and egg yolk, shake thoroughly, pour into a medium bar glass, fill it half full with boiling water, grate nutmeg on top, and serve.