1918] 



LIST OF PUBLICATION'S. 



XI 



JJ. S. Department of Agriculture— Contd. 



Scientific Contributions— Contd. Page. 



The Colorimetric Determina- 

 tion of Hydrogen Ion Con- 

 centration and Its Applica- 

 tions in Bacteriology, W. M. 

 Clark and H. A. Lubs 225 



Endothia Pigments, I, L. A. 

 Hawldns and N. E. Stevens 225 



Observations on an Achlya 

 Lacking Sexual Reproduc- 

 tion, W. H . Weston 225 



South American Forest Re- 

 sources and Their Relation 

 to the World's Timber Sup- 

 ply, R. Zon 246 



Forest Problems and Econom- 

 ic Development in South 

 America, R. Zon 24G 



Practical Wood Preserv^ation 

 Processes for Prolonging the 

 Life of MiU Roofs, C. H. 

 Teesdale 249 



A New Leaf Spot Disease of 

 Cherries, B. A. Rudolph. ... 251 



Some Changes Produced in 

 Strawljerry Fruits by Rhizo- 

 pus nigricans, N. E. Stevens 

 and L. A. Hawldns 252 



Recent Cultures of Forest Tree 

 Rusts, J. R. Weir and E. E. 

 Hubert 253 



Pycnial Stages of Important 

 Forest Tree Rusts, J. R. 

 Weir and E. E. Hubert. ... 253 



Notes on Razoumofshya campy- 

 lopoda, G. G. Hedgcock and 

 N.R.Hunt 253 



Sparassis radicata, an Unde- 

 scribed Fungus on the Roots 

 of Conifers, J. R. Weir 253 



U. S. Departinent of Agriculture — Contd. 



Scientific Contributions — Contd. Page. 



Needle Rust on Pinu^ resinosa, 

 P. Spaulding 253 



Synthetic Culture Media for 

 Wood-destro>dng Fungi, E. 

 J. Pieper, C. J. Humphrey, 

 and S. F. Acree 254 



The Mononchs (Mononchus 

 Bastian 1866), a Genus of 

 Free-li-ving Predatoiy Nema- 

 todes, N. A. Cobb 254 



Segmentation in Nematodes: 

 Observations Bearing on the 

 Unsettled Question of the 

 Relationship of Nematodes 

 to Other Branches of the 

 Animal Kingdom, N. A. 

 Cobb 254 



The Rat Pest, E.W. Nelson. . 255 



Index to the Literature of 

 American Economic En- 

 tomology, January 1, 1905, 

 to December 31, 1914, com- 

 piled by N. Banks 256 



Florida and the Mediterranean 

 Fruit Fly, E, A. Back 262 



Farm Drainage Methods, W. 

 W. Weir 288 



The Influence of Total Width 

 on the Effective Width of 

 Reinforced Concrete Slabs 

 Subjected to Central Con- 

 centrated Loading, A. T. 

 Goidbeck 289 



The Flow of Concrete under 

 Sustained Loads, E. B. 

 Smith 290 



Friction Tests of Concrete on 

 Various Sub-bases, A. T. 

 Goidbeck 290 



