For over a quarter of a century, Dr. Ferguson has been experimenting with the blood of animals and human beings to unravel the very complex chemical processes that underlie blood clotting. The author gives a detailed account of his many original technical procedures. His experimental data and the described results amply consolidate current theories and provide a firm basis for new advances. Originally published in 1960. A UNC Press Enduring Edition -- UNC Press Enduring Editions use the latest in digital technology to make available again books from our distinguished backlist that were previously out of print. These editions are published unaltered from the original, and are presented in affordable paperback formats, bringing readers both historical and cultural value.