Tract on the Tincture and Oil of Antimony  
   A 1985 translation by Kjell Hellesoe of this alchemical treatise by Bacon.
   http://www.levity.com/alchemy/rbacon2.html

The Mirror of Alchemy  
   A brief tract attributed to Bacon, here in an English edition first published in 1597.
   http://www.levity.com/alchemy/mirror.html

Despair over Thirteenth Century Learning  
   An excerpt from Bacon's 1271 work, Compendium Studii Philosophiae. Modernized version of the Brewer translation, provided by the Internet Medieval Sourcebook Project.
   http://www.fordham.edu/Halsall/source/bacon1.html

On Experimental Science  
   An excerpt from Bacon's 1268 work, Opus Tertium. Provided by the Internet Medieval Sourcebook Project.
   http://www.fordham.edu/Halsall/source/bacon2.html