776 



INDEX. 



Teeth, Filling, etc., Johnson, 772. 

 Tridymite, melting point, Ferguson 

 and Merwin, 424. 



U 

 Utah, Green River desert section, 

 Emery, 551. 



Van Name, R. G., preparation of 



hypophosphates, 587. 

 Vertebrae, Evolution of, Williston, 



546. 

 Villavecchia, V., Chemistry, 765. 



W 



Warner, A. R., Dispensaries, 771. 



Wells, H. L., progress of chemis- 

 try, 1818-1918, 259. 



West Virginia, coal beds, Hennen, 

 770. 



geol. survey, 769, 770. 



Whetzel, H. H., Phytopathology, 

 549- 



White, W. P., switch for delicate 



potential measurements, 610. 

 Wieland, G. R., American fossil 



cycads, part VIII, 645. 

 Williams, H. S., obituary notice, 



Schuchert, 682. 

 Winchell, A. N., dustfall of March 



9, 1918, 599- 

 Woodhouse, James, Life of, E. F. 



Smith, 541. 

 Woodruff, L. L., Origin of Life, 770. 



X-Rays, absorption in aluminum, 



Williams, 766. 



Young, C. A., Astronomy, 542. 

 Young, S., Stoichiometry, 689. 



Zinc Industry, Smith, 689. 

 Zoology in America, 1818-1918, Coe, 



355- 



