Front Matter
p. 0
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The Comparative Parasitization of Certain Fresh Water Snails
McCormick, Robert Nathaniel pp. 163-180
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Chemical Composition of the Walls of Certain Algae
Wurdack, Mary E. pp. 181-191
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Alaskan Species of Diptera of the Genus Helophilus, with Notes on Others
Hine, James S. pp. 192-200
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A Useful Cage for the Rearing of Small Insects on Growing Plants
Hartley, E. A. pp. 201-203
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Some Notes on American Tabanidae with the Description of a New Species from Africa
Hine, James S. pp. 204-206
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A Duck with Webless Feet
Schaffner, John H. pp. 207-208
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Back Matter
p. 999
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