SUBJECT INDEX 



6ii 



Monophlegnia, a new genus of Legu- 

 minosae. C. V. Piper. 432. 



fMycorrhiza, Cytrids and related 

 fungi in the roots of our common 

 economic plants. E. G. Arzberger. 

 211. 



fNew Zealand, vegetation of. A. D. 

 Cockayne. 211. 



North Dakota plants, notes on. 

 F. P. Metcalf. 188. 



Ontario, northwestern, new and note- 

 worthy plants from. O. E. Jen- 

 nings. 453. 



\Opuntia lindheimeri and other species 

 (Review of the Cactaceae by 

 Britton and Rose). David Grif- 

 fiths. 421. 



fParks and gardens of Buenos Aires. 

 F. Lamson-Scribner. 211. 



^Paulownia tomentosa, naked panicles 

 of. M. B. Waite. 420, 578. 



Persea (Avocados), preliminary re- 

 vision of North American and West 

 Indian. S. F. Blake. 9. 



fPhytogeography of the Coeur d'Alene 

 basin of northern Idaho. H. B. 

 Humphrey. 501. 



fPlant breeding, problems in tropical. 

 P. J. S. Cramer. 422. 



fPlant pathology in Denmark in re- 

 cent years. F. Kolpin Ravn. 

 502. 



fPoisonous plants and their effects. 

 C. DwiGHT Marsh. 308. 



*Pollen germination of barley. Harry 

 V. Harlan. 391. 



fPorto Rico, botanical aspects of. 

 John A. Stevenson. 210. 



t Potato, wart of. L. O. KunklE. 

 211. 



fRock Creek Park. F. Lamson- 

 Scribner. 580. 



Swietenia, the Venezuelan mahogany, 

 new species of. H. Pittier. 32. 



Swietenia, true mahoganies, revision 

 of. S. F. Blake. 286. 



fTropical plant breeding, problems in. 

 P. J. S. Cramer. 422. 



Ceramics. *Optical glass, thermocouple 

 installation in annealing kilns for. 

 E. D. Williamson and H. S. 

 Roberts. 330. 



*Optical glass melts, cooling of. 



Howard S. Roberts. 329. 

 *Optical pyrometers for control of 



optical glass furnaces, use of. 



Clarence N. Fenner. 49. 

 *Volatilization of lead oxide from lead 



silicate melts. Olaf Andersen. 



330. 



See also Chemical Technology. 



Chemical Technology. *Fractionation, 

 constant temperature still head for 

 light-oil. Frederick M. Wash- 

 burn. 48. 



*Optical glass manufacture, improved 

 methods of. George W. Morey. 

 25. 



*Optical glass melting, technique of. 



Clarence N. Fenner. 25. 

 See also Ceramics. 



Chemistry. Acidity and alkalinity of 

 soil, determining, by indicators 

 in the fields. Edgar T. Wherry. 



217. 



* Cellulose in rubber goods, the deter- 

 mination of. S. W. Epstein and 

 R. L. Moore. 299. 



*Helium, bibliography of scientific 

 literature regarding. Bureau of 

 Standards Circular. 22. 



*Nitrates and nitrites in battery 

 acid, estimation of. L. B. Sefton. 

 299. 



See also Analytical Chemistry, In- 

 organic Chemistry, Physical Chem- 

 istry, and Thermochemistry. 



Civil Service Reform. Reorganized Civil 

 Service, a. Edward B. Rosa. 

 533. 



Conchology. Caecidae and other marine 

 moUusks from northwest coast of 

 America. Paul BarTsch. 565. 



