author
Henry N. (Henry Newell) Guernsey
1817–1885
A leading 19th-century American homeopathic physician, he wrote influential books on obstetrics, materia medica, and family health that were widely circulated in his time. His work is especially associated with the "keynote" approach to prescribing and with medical teaching in Philadelphia.
1 Audiobook
Plain Talks on Avoided Subjects
by Henry N. (Henry Newell) Guernsey
About the author
Born in Rochester, Vermont, in 1817, Henry Newell Guernsey trained in medicine at New York University and went on to build his career in Philadelphia. He practiced there for decades as a physician, surgeon, and obstetrician, becoming a prominent figure in American homeopathy.
Guernsey also taught at the Homeopathic Medical College of Pennsylvania and later at Hahnemann Medical College of Philadelphia, where he served in senior academic roles including professor and dean. He was closely linked with the development and teaching of the "keynote system," a practical method of selecting remedies that shaped how many later homeopathic students studied materia medica.
Among his best-known books are The Application of the Principles and Practice of Homoeopathy to Obstetrics, and the Disorders Peculiar to Women and Young Children, Plain Talks on Avoided Subjects, and Key-notes to the Materia Medica. He died in 1885, leaving behind a body of writing that remained in circulation well after his lifetime.