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Columbia University Biological Series, 
HENRY FAIRFIELD OSBORN. 
1. FROM THE GREEKS TO DARWIN. 
By Henry Fairfield Osborn, Sc.D. Princeton. 
. AMPHIOXUS AND THE ANCESTRY OF THE VERTEBRATES. 
By Arthur Willey, B.Sc, Lond. Univ. 
3. FISHES, LIVING AND ‘FOSSIL. An Introductory Study. 
By Bashford Dean, Ph.D. Columbia. 
4. THE CELL IN DEVELOPMENT AND INHERITANCE 
By Edmund B. Wilson, Ph.D. J. H.U. 
