The book "Letter on Termination of Life, Containing Experiments Showing That It Can Be Safely Used in Animal Surgery" by Hickman Henry Hill is a study that overturns conventional wisdom about the possibilities of medicine. In this book, the author offers visual experiments that testify to the safety of using the method of termination of vital activity during surgical operations on animals. Thanks to a systematic approach and adherence to the principles of experimental medicine, the author proves the possibility of successful use of this method in medical practice. The book is a valuable addition to the knowledge of modern methods and opportunities in medical science.