Here's a showcase of his early history....
Master Of The Elements
But, what does this tale (reprinted in the Flash Annual #1 of 1963, Flash Archives #1 of 1996, Flash Annual Replica of 2001, Flash Chronicles #1 of 2009, Flash Omnibus #1 of 2014 and the Flash: The Silver Age of 2016) to do with Dr. Alchemy?
The Man Who Changed The Earth
This tale was reprinted in 80 Page Giant #9 of 1965, , Flash Archives #1 of 1996, Flash Chronicles #1 of 2009, Flash Omnibus #1 of 2014 and the Flash: The Silver Age of 2016.
A Little Crisis
More on the Crime Champions can be read here, but it took the heroes of two worlds to defeat these villains (including Flashes Barry Allen and Jay Garrick, as members of the Justice League and Justice Society), all in their first Crisis together!
Our Enemy, The Flash
This tale was reprinted in Flash Archives #6 of 2012.
The Mightiest Punch Of All Timehere!).
This tale is reprinted in Flash #196 of 1970.
The Curse Of The Dragon's Eye
Sadly, this tale has yet to have been reprinted.
The Fury Of The Fire-Demon
This tale has not yet been reprinted.