* Fellow in the Medical Sciences of the National Research Council. 1 Anderson, E. H., these PROCEEDINGS, 30, 397-403 (1944). 2 The asparagine medium consisted of: I-asparagine 0.2 per cent, dextrose 0.4, per cent, Na2HPO4 (anhydrous) 0.6 per cent, KH2P04 0.3 per cent, MgSO4 0.005 per cent, NaCl 0.005 per cent, glass distilled water. a The ammonium medium consisted of: NH4Cl 0.1 per cent, dextro...

Electrophoretic phenotypes of the esterase5 locus were examined in the sibling species D. pseudoobscura, D. persimilis and D. miranda. D. persimilir alleles were found to have uniformly higher charge on monomers than corresponding alleles of either D. pseudoobscura or D. miranda. Consequently. D. persimilis shares no alleles in common with either D. pseudoobscura or D. miranda, while the latter...