 He was the first to establish a link between infectious diseases between humans and animals, for which he coined the term "zoonoses".He also introduced scientific terms such as "chromatin", "agenesis", "parenchyma", "osteoid", "amyloid degeneration", and "spina bifida".His concepts on pathology directly opposed humourism, an ancient medical dogma that diseases were due to imbalanced body fluids, hypothetically called humours, that still pervaded.