In 1699, John Woodward published his water-culture (hydroponic) experiments with
spearmint. He found that plants in less pure water sources grew better than plants in distilled water. While still a student, he became interested in botany and natural history, and his attention during visits to
Gloucestershire was drawn to the fossils found there. He began to form the great collection for which he is best known. He published
An Essay toward a Natural History of the Earth and Terrestrial Bodies, especially Minerals, &c. in 1695 (2nd edition 1702, 3rd edition 1723), followed by
Brief Instructions for making Observations in all Parts of the World (1696). He later wrote
An Attempt towards a Natural History of the Fossils of England (2 vols., 1728 and 1729). In these works he showed that the stony surface of the earth was divided into strata, and that the enclosed fossils were originally generated at sea; but his views on the method of rock formation remained unsupported. They were satirized by
John Arbuthnot, who ridiculed what he saw as Woodward's classicist method and personal venality. Nonetheless, Woodward accurately described his rocks, minerals and fossils in his elaborate
Catalogue. Woodward's
The State of Physick and of Diseases... Particularly of the Smallpox (1718) arose from a long-running dispute over
smallpox with
John Freind. Both accused the other of killing their patients (in the modern view a judgement few doctors of that period can escape). Woodward claimed that his experimental evidence showed that smallpox arose from an excess of "bilious salts", whereas Freind saw the causes of the disease as unknowable. ==Dr Woodward's shield==