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Tenth Year. 

 Vol. XX. No. 516. 



DECEMBER 23, 1892. 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advance, 



Contents. 



The Growth of Children. Franz Boas ; 



Some Oddities in Bird-Life. C. W. Swallow.. \ 

 A Definition op "'Solutions." C. E. Linebarger. \ 

 Texas Gypsum Formation. D. H. Cummins... ; 

 On Intergrowths of Hornblende with Augite 



IN Crystalline Rocks. Wm. H. Hobbs — ; 

 Optical Angle and Angular Aperture. Alfred 



a Lane ! 



Subdivisions of the Azoic Arch^an in North- 

 ern Michigan. M. E. Wadsivorth i 



Potato Scab. H. L. Bolleif ; 



On Natural and Artificial Immunity. O. Loew. i 

 Some Relics op Primitive Fashions in India. 



Kedartiath Basil J 



Letters to the Editor. 



Notes on a Captive Pocket -Mouse. F. 



Stephens i 



Confusion in Weights and Measures. Wil- 

 liam P. Mason I 



Is There a Sense of Direction? W. F. Cum- 

 mins I 



The Need for Popular Scientific Instruction 

 on Oriental Subjects. Merwin-Marie Snell i 



Algebraic Notation. Joseph V. Collins I 



Electric Phenomena on Mountains. H. A. 



Hazen ! 



A Multiple Key.— Preliminary Note. Charles 



B. Bliss ; 



Excitement over Glacial Theories. G. Fred- 

 erick Wright ; 



Notice of the Occurrence of Nyctale Rich- 

 ardsoni Richardson's Owl, in Nebraska. 



Erwin H. Barbour ; 



Vagueness of Localization in a Child. M. 



Scripture J 



Ballistic Galvanometer. E. W. Scripture.. '• 

 Book Reviews ; 



THE 



M Te 



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