His contributions to practical medicine were also important. He was the first to use an aural speculum for the diagnosis and treatment of diseases of the ear, and his writings on surgical subjects are still of interest. He published two treatises on ulcers and tumors, a treatise on surgery, and a commentary on Hippocrates's book on wounds of the head. In his own time he was regarded as somewhat of an authority in the field of sexuality. Fallopio was the first to describe a condom (in his writings, a linen sheath wrapped around the penis), and he advocated the use of such sheaths to prevent syphilis. In an early example of a clinical trial, Falloppio reported that he tested these condoms in 1,100 men, none of whom contracted syphilis. Falloppio was also interested in every form of therapeutics. He wrote a treatise on baths and thermal waters, another on simple purgatives, and a third on the composition of drugs. None of these works, except his "Anatomy" (Venice, 1561), were published during his lifetime. As we have them, they consist of manuscripts of his lectures and notes of his students. They were published by Volcher Coiter (Nuremberg, 1575).