In 'A Memoir of the Late Lewis David von Schweinitz, P.D', Walter Rogers Johnson delves into the life and scientific contributions of the prominent mycologist, Lewis David von Schweinitz. Through detailed accounts and personal anecdotes, Johnson provides readers with a glimpse into the early 19th-century scientific community and the importance of von Schweinitz's work in the field of mycology. Johnson's prose is scholarly yet engaging, making the book accessible to both academics and general readers interested in the history of science. The memoir also highlights the relationship between von Schweinitz and other notable figures of his time, shedding light on his influence within the scientific community. Overall, the book serves as a valuable resource for understanding the life and work of this influential mycologist. Walter Rogers Johnson's expertise in the field of mycology and his admiration for von Schweinitz's contributions are evident in his meticulous portrayal of the scientist's life and legacy.