First Published in 1988. The reader is invited to explore this collection of early German papers and not to analyze the work through a comparison with the present but to approach it with a relaxation of bias that extends a new hearing to old ideas. The reader may be surprised to see how little has changed in the association or callosal theory of apraxia since this review by Liepmann. Of interest is the care with which Liepmann studied his patients and the ingenious anatomical accounts.