SUBJECT INDEX 



677 



*Optical glass, volatilization of iron 

 from pots [used for], by chlorine at 

 high temperatures. J. C. Hos- 

 TETTER, H. S. Roberts and J. B. 

 Ferguson. 640. 



*Silica brick, constitution and micro- 

 scopic structure of. Herbert Ins- 

 LEY and A. A. Klein. 558. 

 See also Ceramic Chemistry. 

 Chemistry. Bucher cyanide process for 

 fixation of nitrogen, note on. Eu- 

 GEN PosNjAK and H. E. Merwin. 

 28. 



fGas warfare at the front. Byron C. 

 Goss. 604. 



fPhysical" vs. "Chemical" forces. 

 P. V. Wells. 361. 



Pinaverdol, crystallography and op- 

 tical properties of. Edgar T. 

 Wherry and Elliot Q. Adams. 



See also Physical Chemistry, Inorganic 

 Chemistry, Analytical Chemistry, 

 Chemical Technology. 



Climatology. fHot spell of August, 

 1918, the. J. H. Henry. 140. 



Crystallography. Apparatus for growing 

 crystals under controlled conditions. 

 J. C. Hostetter. 85. 

 fCrystallography, some practical ap- 

 plications of. Edgar T. Wherry. 

 383. 

 Crystals, assignment of, to symmetry 

 classes, reply to Dr. Tuttoij's dis- 

 cussion of. Edgar T. Wherry. 

 99- 

 Mimetic crystals, classification of. 

 Edgar T. Wherry and Elliot 

 Q. Adams. 153. 



Morphine and certain of its deriv- 

 atives, crystallography of. Edgar 

 T. Wherry and Elias Yanovsky. 

 505. 



Pinaverdol, photographic sensitizing 

 dye, crystallography and optical 

 properties of. Edgar T. Wherry 

 and Elliot Q. Adams. 396. 



Sulfur crystal, an unusual. F. Rus- 

 sell V. Bichowsky. 126. 



Tutton's discussion of the assignment 

 of crystals to symmetry classes, 

 reply to. Edgar T. Wherry. 99. 



X-ray analysis and the assignment of 

 crystals to symmetry classes. 

 Alfred E. H. Tutton. 94. 

 Economics. *Potato flour and potato 



bread. J. A. LeClERC. 285. 

 Electricity. *Cells, dry, electrical char- 

 acteristics and testing of. Bureau 

 OF Standards Circular. 340. 



Conductivity of insulating materials 

 at high temperatures, methods of 

 measuring. F. B. SiLSBEE and R. 

 K. Honaman. 252. 



*Oscillations, electrical, in antennas 

 and inductance coils. John M. Mil- 

 LER. 171- 

 Engineering. *Marbles of the United 

 States, physical and chemical tests 

 on the commercial. D. W. Kess- 



LER. 444- 

 *Piers, large brick, compressive 



strength of. J. G. Bragg. 409. 

 Entomology. *Aculeata, the parasitic, a 



study in evolution. W. M. Wheel- 



ER. 638. 

 \Aphididae, intermediates in the, and 



their relation to alternate hosts. 



A. C. Baker. 287. 

 *Coleoptera, memoirs on, VIII. 



Thomas L. Casey. 79. 

 *Diptera, contribution to biology of 



North American. Charles T. 



Greene. 328. 

 fEvolution, insect, fundamental fac- 

 tors of. Jacob Kotinsky. 358. 

 fFruit insects, notes and watercolor 



drawings of. R. E. Snodgrass. 23. 



*Cracilariidae, revision of North Amer- 

 ican, from standpoint of venation. 

 Charles R. Ely. 327. 



fHydrocyanic acid gas and its use in 

 the control of insects. E. R. Sass- 

 CER. 82. 



