THIS NUMBER CONTAINS THE TITLE AND CONTENTS TO VOL. XX, 
May, 1887. 3 n Vol. XXI., No. 
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AMERICAN 
NATURALIST 
A MONTHLY JOURNAL 
DEVOTED TO THE NATURAL SCIENCES 
IN THEIR WIDEST SENSE. 
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CONTENTS: 
PAGE a 
THE PRESENT CONDITION OF THE NATURAL SCI- a —Some New T-eniodonta of the: 
ENCES JN SWEDEN. Filop Trybom -ss =e 499 Puerco.— Mr. Hill on the Cretaceous of Texas. . _ 
i: : eco and Petrography. — Peivsgmmsbicat 
- : Gi ss 5 ` 
FIDDLER-CRABS. $ M'Nair Wright 415 News Piipari es.—Mineralogical N he 
TSCHNIKOFF ON GERM-LAYERS Someni cal Integration.—Miscellaneous . >... o.. 
A Translated by H. V. Wilson. . . 419 _ Botany. —Smut i in e - Students as Pepe i 
pey "a GARDEN VEGETABLES (cont b B. : he oo Re a ot 
car ae ee mia Exntomology.—On the igh = a Caddice- 
THE MESOZOIC AND CÆNOZOIC REALMS OF THE Fly from the Water.—Destruction of the Codlin- 
INTERIOR OF NORTH AMERICA. Æ. D. Cope. . 445 Moth by Arsenical Poisons.—On the “ite nry of 
EDITORS’ TAB a — Parasite of re Silkworm.—Entomologi- 
A Universal Langage eee wk wie yo ee 462 tal NewS. < Goce et ete ee a 
"The Sea-Serpent. > -ero ronn 463 ieke ry.-Artincial Parthenogenesis. Shier of 
RECENT LITER! - Encysted. Forms.—Sense-Organs of | es [H 
ortman on ie ak of the a, ee 463 lustrated].—Organ of Smell in T 
Larval Galeodes. —Zoological News eee 
Kedzie's anne Solar Heat,and Sun-Spots. . 464 
Cope’s Origin of the Fittest. ‘iiustrated.) 465 Embryology. Bir P of the Monotre- 
Geyler and poe é Pliocene Florat:  : -<-> is mata and Marsupialia. -...- +--+... aoe 
CENTRAL NOTES. ScreNtivnic sews. -o n a oe 
Geology and Palgontology.—American Triassic PROCEEDINGS OF SCIENTIFIC SOCIETIES ..- ee 
J. B. LIPPINCOTT COMPANY, PHILADELPHIA. 
London: 10 Henrietta a ers Garden. 
amd at Philadelptäa Post-Offce: as onde 
