Phosphoglucose isomerase11Slein (6) has pointed out that the two isomerases which convert G-6-P and mannose 6-phosphate (M-6-P) into F-6-P, may now be more descriptively called phosphoglucose isomerase and phosphomannose isomerase, respectively, since it is now known that F-6-P is the product of M-6-P isomerization also. We propose to adopt this nomenclature. of green gram (Phaseolus radiatus)