§4.60 per Year (Foreign). 



AMERICAN 

 NATURALIST 



A MONTHLY JOURNAL 



DEVOTED TO THE NATURAL SCIENCES 



IN THEIR WIDEST SENSE. 



MARCH, 1892 



CONTENTS 



ES. . S. V. Clevenger, M. D. 195 brate Fossils 



of Plant Physiology as at Means of Fossil Plants 



ng in Germany and England. j Mineralogy and Petrography.— -Petrograph 



£. L. Gregory. 211 I News— Mineralogical News 



he Snake Pla,ns of Idaho. | Baany _ The Sargasso S ea_Ferns of the Bl 



C. Hart Mernam 218 \ HilIs __ Notes on the FIora of Western South Dal 



■ Pamphlets 223 j _ The Range _ The Black Hills— The Bad Lai 



£.— Kuntze's Revisio Generum, j Z oo/ogy. - Work of Earth-worms in Yor 



Coin 



-1 ' : ' 



e Address of Prof. Kolliker— j rep tans— New Fishes from Chihuahna, Mexico - 



omach vs. Brains— Donation of j Description of a New Mouse from Southern Cali- 



:J. Wistar— Mongoose in the West j fornia— Zoological News I 



make Mistakes— Change of Pub- | £mi ryo/ogy.- Anatomy of a Human Embryo— 



234 Thyreoglossal Tract and the Hyoid— Origin of Spinal 



Ganglia in Man— Somites of Human Embryos. . : 

 Travel.— Recent Australian Ex- Entomology.— Descriptions of New North Ameri- 

 237 can Bees : 



; Agent-V 



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