"Ethical problem; or, Expenditures for Scientific Experiments on Man and Animals" is a work by renowned author Albert Leffingwell that deals with the complex subject of human and animal experiments. The book invites the reader to think about the moral aspects of this problem and the principles that should guide scientific activity. The author draws attention to the importance of taking into account ethical norms during research, as well as the need to treat animals and people who participate in experiments with care. This book will be a valuable source of information for those interested in ethics and science.