Bioassay of chromatograms of aqueous potato-sprout and -tuber extracts and lettuce-seed extracts, with the coleoptile, straight-growth test, indicates the presence of a growth promoter running near to the position of IAA and giving a spray colour reaction with Ebrlich reagent similar to that of IAA. It is shown that both promotion and spray colour are due to sugars. It is concluded that major nutrients may give large growth effects in this bioassay and that in certain cases ether extracts may contain quantities of these large enough to give rise to growth effects.