Scope and Contents The unsorted material is composed of: circa 90 off-prints articles from botany journals; spring-file containingThe effect of the relative length of the light period on the growth of the cucumber; correspondence; off-prints; 3 volumes notebooks with notes and calculations; list of publications by M. M. Yeoman; 5 files containing unfinished manuscripts ofPlant growth; miscellaneous files with drawings, notes, and photographs; and wooden box of slides and an envelope containing broken slides....