This knowledge, joined to what he had gathered by historical reading of equally unusual extent, he carefully digested and gave to the world in his Biographisch-literarisches Handworterbuch zur Geschichte der exacten Wissenschaften, containing notices of the lives and labours of mathematicians, astronomers, physicists, and chemists, of all peoples and all ages.
Wagner's Handworterbuch der Physiologic, his Allgemeine Physiologic des Korperlichen Lebens (Leipzig, 1851), and his Medizinische Psychologie oder Physiologic der Seele (Leipzig, 1852).
Mention should also be made of: Handworterbuch der lateinischen Sprache (5th ed., 1874); Romische Litteraturgeschichte (1847), of which only the introductory volume appeared; an edition of the treatise De Graecae linguae particulis (1835-1842) of Matthaeus Deverius (Devares), a learned Corfiote (c. 1500-1570), and corrector of the Greek MSS.
He published Entwicklungsgeschichte der Chemie von Lavoisier bis zur Gegenwart (1868) and other works on chemistry, collaborated in a Handworterbuch der Chemie (13 vols., 1882-96), and wrote a volume of reminiscences, Lebenserinnerungen (1912).
He was a contributor to the Handworterbuch of Liebig, Willer and Poggendorff, and to the Graham-Otto Textbook of Chemistry, and for many years was a member of the committee of revision of the Pharmacopoeia Germanica.
In 1843, after his removal to Gottingen, he began his great Handworterbuch der Physiologie, mit Riicksicht auf physiologische Pathologie, and brought out the fifth (supplementary) volume in 1852; the only contributions of his own in it were on the sympathetic nerve, nerve-ganglia and nerve-endings, and he modestly disclaimed all merit except as being the organizer.
Of the earlier encyclopaedias we may notice the famous HandwOrterbuch der reinen and angewandten Chemie, edited by Liebig; Fremy's Encyclopedie de chimie, Wurtz's Dictionnaire de chimie pure et applique'e, Watts' Dictionary of Chemistry, and Ladenburg's HandwOrterbuch der Chemie.