-^ 



Tenth Year. 

 Vol. XX. No. 517. 



DECEMBER 30, 1893. 



Single Copies, Ten Cents. 

 13.50 Per Yeah, in Advance. 



Contents. 



Vandalism Among the Antiquities of Yucatan 



AND Central. America. M. H. Saville — 30 

 Ancient Japanese Clopks. Frank D. Skeel . . 30 



Some Biological Notes on Amblystoma Ti- 



GRINUM I. Henry Leslie Osboni 3B 



Reflex Action in Turtles. M. J. Elrod 36 



A Laboratory of Plant Diseases, C. W. 



Woodworth 30 



An Important Collection of Mollusca. Henry 



A. Pilsbry 30 



NoN- Euclidean G-eometry. G. A. Miller 37' 



Altakapas Country. John Gifford 37. 



Letters to the Editor. 



Nervous Diseases and CiTilization. A. Z>. 



Rockwell 37; 



Observations on the Cretaceous at Gay 



Head. P. JR. Vliler 37i 



The Reticulated Structure of Protoplasm. 



Alfred C. Stokes 37' 



Auroral Displays. James Hyatt ... . 37' 



Alleged Extinction of Mulatto. Ja^. Lewis 



Hoive. 



Book Reviews. 



Lessons in Elementary Mechanics 375 



Elementary Manual of Applied Mechanics. . 375 



Geodesy 375 



Introduction to Geodetic Surveying 375 



Coals and Cokes in West Virginia ...... . 370 



A Manual of Physics 370 



The Woodworkers"' Manual 377 



Among the Publishers 377 



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