This book presents the findings of a five-year study on the physiology of heredity. The authors sought to confirm Mendel's theories on genetics and investigate the phenomenon of prepotency – the belief that inbred animals are more likely to pass on their own characteristics. The book reports on experiments conducted with poultry and plants, examining the inheritance of various traits. The results confirm Mendel's law of heredity and provide evidence for the existence of prepotency. The findings shed light on the nature of genetic inheritance and the potential effects of inbreeding. This book is a valuable resource for biologists, geneticists, and anyone interested in the science of heredity.