""How to Prolong Life"" is a book written by C. De Lacy Evans that explores the causes of old age and natural death, and offers advice on how to prolong human life on earth. The book delves into the effects of diet and various agents on the human body, and provides insights on which ones are best adapted for a lengthened prolongation of life. With a focus on healthy living and longevity, this book is a valuable resource for anyone interested in improving...