EDITOR B2, Gi, G2, and BiA under the conditions of the experiment. Differences in the behavior of strains of C. pyrenoidosa and C. vulgaris to the action of various herbicides can be and have been attributed to strain differences (Vance and Smith, 1969; Thomas et al., 1971) and to differences in growth conditions. By changing from autotrophic conditions to heterotrophic conditions by the addition of a reduced carbon source such as glucose, it has been shown that the inhibitory effects of some herbicides which affect the photosynthetic process on strains of C. pyrenoidosa and C. vulgaris can be reversed (Geoghagen, 1957; Ashton et al., 1966; Sikka and Pramer, 1968). In order to reduce the time of the assay and in order to avoid special provisions for a carbon dioxide source, glucose has been used as a carbon source under our conditions.The results presented here emphasize the importance of strain differences when Chlorella is used as a test organism. LITERATURE CITED

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A carboxypeptidase has been separated from the known proteases of germinated barley by column chromatography on Sephadex G-100 and carboxymethyl cellulose. This enzyme released the Cterminal amino acids from various CBZ-dipeptides, hippuryl-L-phenylalanine, and a-and /3-casein and also hydrolyzed hippuryl-DL-/3-phenyllactate. It showed no endopeptidase or dipeptidase activity.The enzyme was most stable in succinate buffer in the pH range 3 to 6. Cysteine had a slightly stabilizing effect on enzyme activity, potassium brómate produced partial inhibition, and /7-chloromercuribenzoate produced inhibition varying from 22 to 100%, depending on the substrate used. Cu2+, Ni2+, and Zn2+ showed a small inhibitory effect and Fe3+ was strongly inhibitory.