Family

Applegreen's Bar Book by John Applegreen (1904, p.61) — Applegreen 1904

0.5 whole limeLime juice (fresh) — juice of half a limebase
1 jiggerScotch whisky base
Soda water — seltzerdilution
1 small lumpice — iceother
1 barspoonsugar — powdered sugarsweetener
  1. Build the lime juice, Scotch whisky, and ice in an old-fashioned toddy glass.
  2. Fill with seltzer and add a small barspoon of powdered sugar.

Ice: Small lump

Nose
Lime and Scotch rise lightly from the charged glass.
Palate
This is a nice family-tree link because it sits between the unsweetened Rickey idea and the sweeter highball tradition rather than aligning perfectly with either.
Finish
The finish is fizzy, tart, and lightly sweetened.
Summary
A Scotch-lime highball hovering between Rickey and sweetened soda service.

See also: Whiskey Rickey, Mamie Taylor, Scotch Whisky Cooler