Thanks to the quality of his combining knowledge in two different sciences, Dr Janez Bleiweis, the medical doctor and veterinarian, made himself valued in various spheres of life of the Carniola of the 19th century. Although most of his creative power was dedicated to politics, he also made valuable contributions in veterinary education and practice. As the secretary of the Agricultural Society he had opportunity to make himself known as a writer of popular articles on various health topics published in the newspaper »Novice« (The News). Most of his articles dealt with contagious diseases, such as smallpox and cholera, as well as with the danger of rabies and transmission of zoonoses to human. They were written in a clear and simple language, accessible to a wide readership. The articles were intended to enlighten and educate the public, and thus combat superstition. The author propagated vaccination against smallpox, promoted personal and general hygiene as an effective tool in the battle against cholera, and informed the readers about the latest achievements in the field of medicine. In addition to mounting campaigns against cholera, he also ran a Ljubljana hospital providing treatment to cholera patients. As the director of Ajdovščina Maternity Hospital, he concentrated on the problems of high mortality due to postpartum sepsis. He managed to improved the existing conditions by extending the hospital facilities. The functions of county delegate to the Parliament was another important task assigned to Dr Janez Bleiweis, and he performed it to the great benefit of Carnolian medicine. Thanks to all these outstanding accomplishments, Dr Janez Bleiweis ranks as one of the most important doctors and health educators of his time.