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THE 

 PRINCIPLES OF 

 STRATIGRAPHY 



BY 

 AMADEUS W. GRABAU. S.M., S.D. 



PROFESSOR OF PALEONTOLOGY IN 

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"' Should be on the reference ehelf of every col- 

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Catalogue of the Hemiptera of 

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By Edward P. Van Duzee Cloth, $5.50 



A Metbod for tbe Measurement of Self and Mutual 



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An Unusual Extension of tbe Distribution of tbe 

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Albert L. Barrowa 20 



On the Orientation of Brythropsls. by Charles A. 



Kofoid and Olive Swezy 15 



Crlthidia Euruoplithalmi, sp. noT. from tbe Hem- 



ipteran Bug, E iin/oplMtalmux Convlmm, Stal, 



by Irene McCullooh 15 



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62 



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