Hydrogen was initially thought to be toxic based on experiments by Lavoisier, however, the purity of the hydrogen was taken into question when later experiments discovered hydrogen to effectively treat measles in the 1790s.
* factitious air (Boyle)
* hydrogene – means "water former" from hydro- and gene-
* inflammable air
* inflammable gas
* base of inflammable air
*zincic inflammable air
*martial inflammable air