This article reports on a symposium commemorating Lillien Martin's dissertation, "Analysis of Difference Sensations," by published in 1899. The symposium marked the centenary celebration in acknowledgement of Martin's pioneer efforts for women in the field of psychology. Psychophysics was concerned with the quantitative assessment of sense perceptions. Her dissertation work began by measuring different thresholds in weight perception to demonstrate that psychophysical measurements can be made to establish sensitivity to stimulus differences. In an attempt to determine differences to stimuli, Martin and her mentor, Georg Elias Muller, investigated factors that could affect the results of these measurements. Circumstances interfered with her completion of her work in psychophysics. She went on to contribute other research to the field of psychology. (JDM)