Dr. William Henry Welch talking about what he learnt from Professor Carl Ludwig. pg 44 The Great Influenza. The full quote refers to American medicine’s shortcomings in the early 20th century. ” the most important lesson for everyman of science, not to be satisfied with loose thinking and half proofs, not to speculate and theorize but to observe closely and carefully….preceeded by Welch’s thought-” I hope that I have learnt from Professor Ludwig’s precept and practice…..”
Dr Emile Kraepelin was of the same ilk as Professor Ludwig and Dr William Henry Welch. They were forward thinking meticulous scientists, following in the scientific footsteps of Charles Darwin.
Of Sound Mind 