Eleventh Year. 

 Vol. XXI. No. 527. 



MARCH 10, 1893. 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advance. 



Contents. 



The Boturiki-Aubin-Godpil Collection of 



Mexicana. D. G. Brinton 127 



Time-Periods of the Mayas. Cyrus Thomas.. 128 

 Notes on the Formation of the Iron Ores. 



James D. Eobertson 131 



Notes and News 131 



An Old Volcanic Eruption in Iowa. Charles 



B. Keyes 132 



The Permian in Prince Edward Island. F. 



Bain 132 



Notes on the Wing-Color of North American 



Locusts Belonging to the Sub-Family 



(EDIPODIN.S:, AND Its Seeming Relation to 



Climatic Conditions. Lawrence B7-uner. . 133 



CuRRE.sT Notes on anthropology.— XXIV. X>. 



G. Brinton, Editor 133 



Letters to the Editor. 



a Reply to Professor Hathaway. JE. A. 



Bou-se'r 134 



A Question of Evidence. W. H. Holmes 135 



The Neanderthal Skull. D, G. Brinton 136 



Aerial Bubbles. Henry U. Sioinnerton 130 



Hardy Towhee Buntings. Albert B. Fam- 



ham 136 



The Speech of Children. Howard Lilien- 



thal 136 



Solidungulate Pigs. Elliott Coues 137 



Book Reviews. 



Original Papers on Dynamo Machinery and 

 Allied Subjects 137 



Electricity and Magnetism 137 



Contributions from the Botanical Labora- 

 tory of the University of Pennsylvania 137 



Bulletin of the Scientific Laboratories of 

 Denison University 137 



An Introductory Manual for Sugar Growers. 138 

 Among the Publishers 139 



Entered at the Post-OCRce of New Yort, N.Y., as 

 Second-Class Mall Matter. 



J. B. Lippincott Company 



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LIFE OF 

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OUR OWN BIRDS. 



A natural history of the Birds of the United States, 

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QUERY. 



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First inserted June 19, 1891. No re- 

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