He wrote the 'Domestic Physician ', and the ' Guiding Symptoms', a monumental work of 10 volumes. It is in the sphere of drug provings, however, that Hering's effort shines at its best. It has been remarked by Nash and others that if Hering had done nothing else for medicine but the proving of the single drug Lachesis , the world would owe him an everlasting debt of gratitude; that alone would immortalize him . Dr. Hering proved 72 drugs, out of which the following are the most important: Cantharis, Colchicum, Iodum, Mezereum, Sabadilla, Sabina, Psorinum, Nux moschata, Lachesis, Crotalus, Apis, Hydrophobinum, Phytolacca, Platina, Glonoin, Gelsemium, Kalmia, Ferrum-met, Fluoric acid, and Phosphoric acid .