( Continued from page 3 of cover.) 



VOLUME 58. 



1. Ames, A. Jb., Proctor, C. A., and Ames, Blanche. — Vision and the Technique of Art. 



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2. Birxhoff, George D. and Langer, Rudolph E. — The Boundary Problems and Develop- 



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3. Vatnio, Edward A. — Lichenes in Insula Trinidad a Professore R. Thaxter Collecti. 



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6. Baxter, Gregory P., Weathehtll, Philip F. and Scripture, Edward W., Jr. — A 



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8. Brues, Charles T. — Some New Fossil Parasitic Hymenoptera from Baltic Amber. 



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9. Kennelly, A. E. — Text of the Charter of the Academie Royale de Belgique, Trans- 



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10. Hitchcock, Frank L. — On Double Polyadics, with Application to the Linear Matrix 



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12. Swan, Clifford M. — The Minimum Audible Intensity of Sound, pp. 423-441. 



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