20 Journal of the Mitchell Society [September 



Analysis of Crystal Structure from X-Ray Spectra. A. A. Dixon. 



The Color of Metals by Transmission. Otto Stuhlman, Jr. (Lan- 

 tern). 



Use of an Audion Tube as Negative Resistance. D. A. Wells. 



Problems of Research in North Carolina. (By title.) C. W. Ed- 

 wards. 



Some Suggestions for the Teaching of Physics. A. H. Patterson. 



The following papers M^ere presented to the Chemists : 



Zirconium Ferrocyanide. F. P. Venable and R. A. Lineberry. 



Zirconium Citrate. F. P. Venable and E. C. Moehlmann. 



Modification of the Official Sodium Method. J. 0. Halverson, L. E. 

 Morgan and J. H. Schultz. 



The Determination of Potassium in the Official Sodium Method. J. 0. 

 Halverson and J. A. Schultz. 



A Modified Thermoregulator. M. L. Hamlin. 



A Convenient Form of Condenser. M. L. Hamlin. 



Phenolsulphonphthalein and Some of its Derivatives. W. N. Orn- 

 DORFF and F. "W. Sherwood. 



Binary Systems of Metanitrotoluene and Another Mononitrotoluene. 

 J. M. Bell and J. L. McEwen. 



The Nitration of Certain Nitrotoluenes. J. M. Bell and W. B. 

 Smoot. 



The Nitration of Orthonitrotoluene. J. M. Bell and H. G. Pickett. 



The Chlorination of 2-Amino-p-cymene. A. S. Wheeler, and I. V. 

 Giles. 



New Derivatives of 2-Jiromo-5-hydro.ry-l,4-Naphfho(fuinouc. A. S. 

 Wheeler and B. Naiman. 



Bert Cunningham, Secretary. 



