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PHILIP P. CALVERT, Ph.D., Editor. 
E. T. CRESSON, Jr., Associate Editor. 
HENRY SKINNER, M.D., Sc.D., Editor Emeritus. 
2 ADVISORY COMMITTEE: 
EZRA T. CRESSON. ; J. A. G. REHN. 
PHILIP LAURENT. ERICH DAECKE. H. W. WENZEL. 
2 PHILADELPHIA: 
THE ACADEMY OF NATURAL SCIENCES, 
2 LOGAN SQUARE. 
Entered at the Philadelphia Post-Office as Second-Class Matter. 
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