Thus, bitter almonds contain two substances, Amygdalin and synaptase, which can be extracted, in a separate state, from the bitter almonds.
"Critiques and Addresses"
Thomas Henry Huxley
A short time after Cagniard de la Tour discovered the yeast plant, Liebig, struck with the similarity between this and other such processes and the fermentation of sugar, put forward the hypothesis that yeast contains a substance which acts upon sugar, as synaptase acts upon Amygdalin.
"Critiques and Addresses"
Thomas Henry Huxley