Abstract
Three batches of Bacto-Casitone have been examined quantitatively for their free and total amino acids using paper chromatography. Variation occurs in the free amino acids in the three batches. The spots due to the peptides have been found to be a mixture of peptides. When casitone was examined for its strepogenin activity using the medium of Steele, Sauberlich, Reynolds and Baumann1, and Kodicek and Mistry2 the stimulatory pattern in the two media appeared to be different. The three batches showed similar strepogenin activity.