FREE AMINO ACIDS IN BLOOD. III 395 
et al.22 who examined a small number of patients with various types of leukemia by 
paper chromatography. Their methods for the separation of plasma and cells have not 
been satisfactory in our hands (see part I) and the grouping together of all the differ- 
ent forms of leukemia, both treated and untreated, for consideration is totally un- 
justified in our experience. One surprising finding in view of the results from the 
present studies was the inability of MCMENAmy et al. to observe a characteristic free 
amino acid pattern for each type of leukocyte. As pointed out in the present paper, 
cells from lymphocytic, myeloblastic, and monocytic leukemias could be differentiated 
readily on the basis of their free amino acid patterns and illustrations of the charac- 
teristic patterns observed in other forms of leukemia are presented in other parts of 
this series. This difference is presumably due to the very small number of samples 
examined by the other investigators and to differences in the methods employed. 
References p. 447/448 
