Mr, Henry on Ferments and Fermentation, 273 



Experiments and Observations on Ferments 

 and Fermentation; by which a Mode of 

 exciting Fermentation in Malt Liquors, without 

 the Aid of Yeast, is pointed out; with an 

 Attempt to form a new Theory of that Procefs, 

 By Thomas Henrv, F. R. S. Read April 20! 

 1785. 



Nee manet ulla ful fimllls res ; omnia migrant ; 

 Omnia commutat Natura et vertere cogit. 



Lucretius. 



QF all the procefles of chemiftry, there is, 

 perhaps, none, the phsenomena of which 

 have been lefs fatisfaaorily explained, than thofe 

 of Fermentation. The writers on Chemiftry 

 have been content to defcribe the feveral ap- 

 pearances, the progrefs and refult of fermenta- 

 tion, and have declined any inquiry into its 

 primary caufes, or into the mode by which the 

 changes, induced by it, are efFeded in bodies, 

 wluch arc the obje^s of its adion. 



Within thefe few years, great changes have 

 taken place in the theory of ChemiflrV- The 



^°^' ^^' T important 



