The book "Earth Rays as Pathogens" by Gustav Freiherr von Pohl offers an in-depth analysis of the hypothesis that earth rays can act as triggers for cancer. Originally published in 1932, the treatise is based on the results of pseudoscientific experiments conducted in the late 1920s. The author examines the connection between cancer and certain geological phenomena such as "irritation currents" and "water veins." This topic remains relevant today, particularly among proponents of radiesthesia, who regard the baron as a credible source. The book includes 71 black-and-white illustrations that visually support the argument and clarify the historical perspective on the subject. The reprint of the original 1932 edition allows readers to trace the views and scientific discourses of that time.