LIST OF PUBLICATIONS 



[Vol. 43 



TJ. 8. Department of Agricultve — Con. 



Bureau of Soils — Continued. 



Field Operations, 1918— Page. 

 Soil Survey of Traill 

 County, N. Dak., F. Z. 

 Hutton and E. Nich- 

 ols 209 



Scientific Contributions : ^ 



The Moisture Equivalent in 

 Relation to the Mechani- 

 cal Analvsis of Soils, H. 



E. Middieton 210 



Colorimetric Determination 

 of Hydrosen-ion Concen- 

 tration without Buffer 

 Mixtures, with Especial 

 Reference to Soils, L. J. 



Gillespie 211 



Preparation of Nitrogen and 

 Hydrogen Mixture by De- 

 composition of Ammonia, 

 R. O. E. Davis and L. B. 



Olmstead 220 



Notes on Trees and Shi'ubs 

 in the Vicinity of Wasli- 



ington, W. W. Ashe 222 



New and Old Species of 



Optuntia, D. Griftiths 222 



A Non-splitting Smyrna Fig 

 and its History, G. P. Rix- 



ford_^ 230 



A Preliminary Revision of 

 the North American and 

 West Indian Avocados 

 (Persett spp.),S. F.Blake_ 230 



The Conservation and Ap- 

 plication of Manures, A. 

 D. Sliamel 239 



Results of Five Years' In- 

 dividual Tree Perform- 

 ance Records witli Pruned 

 and Unpruned Lemon 

 Trees, A. D. Shamel 239 



TK 8. Department of Agricultnre — Con. 



Scientific Contributions — Con. 



Tlie American Nut Industry I'age. 

 as a Whole, C. A. Reed__ 240 



Revision of the True Ma- 

 hoganies (Swietenia), S. 

 F. Blake___J 241 



Scientific Research in 1919 

 [on White Pine Blister 

 Rust], 1'. Spaulding 249 



Dusting V. Spraying for the 

 Control of Avocado Insect 

 Pests, G. F. Moznette 255 



A Revision of the Nearctic 



Termites, with Notes on _ 



r>iology and Geographic A 



Distribution, N. Banks ^ 



and T. E. Snyder 256 | 



New Moths fi'om Mexico, I 



H. G. Dyar 258 



A Second Culex of the Sub- 

 genus Transculicia, H. G. 

 Dyar 258 



Note on the Sultgenus Neo- 

 culex of Culex, II. G. 

 Dyar , 258 



The Mosquitoes of British 

 Colunil)ia and Yukon Ter- 

 ritory, Canada, H. G. 

 Dyar 258i 



Irrigation Practices, A. O. 

 Kay 279:1 



Studies of Maintenance 

 Work on Drainage Ditches, 

 H. M. Lynde 280:^ 



Investigations in Adapting 



the Automobile to Accu- . 



rate Soil Survey and Road « 



Traverse Work, W. T. 

 Carter, jr., J. F. Stroud, 

 and T. M. Bushnell 281 



Dairying Turned the Trick, 



J. C. McDowell 291 



The Banker's Part in Mar- 

 keting, G. Livingston 294 



Printed in scientific and technical publications outside the Department. 



