In the 1530s  I showed people the importance of surgery and anatomy and wrote a pamphlet on blood letting, a popular treatment for common illnesses. This pamphlet was supported by my  knowledge on the blood system and showed how anatomical dissection could also be used in test speculation and emphasized the significance on understanding the human body in medicine. In 1539 Paduan became interested in my work and donated bodies from executed criminals to my human dissections. Now I was able to make repeated and corresponding dissections on humans and in 1543 i published De Humani Corporis Fabrica based on my knowledge.