LIST OF PUBLICATIONS. 



[Vol. 41 



U. S. Department of AgricultJirc — Con. 



Scientific Contributions — Con. Page. 



On the Origin of Ctiicle with 

 Descriptions of Two New 

 Species of Aehras, H. Pit- 

 tier 653 



Pan American Cooperation 

 in Plant Quarantine, C. L. 

 Marlatt 654 



Apple Powdery Mildew a 

 Serious Menace to Or- 

 chards, D. F. Fisher 657 



June Drop and Its Relation 

 to the Weather, C. A. Jen- 

 sen 658 



Summary of the White Pine 

 Blister Rust Situation, H. 

 Metcalf 659 



Derris as an Insecticide, 

 N. E. Mclndoo, A. F. 

 Sievers, and W. S. Abbott- 661 



Ear Worm Injuries to Corn 

 and Resulting Losses, 

 R. C. Smith 665 



Observations on Wingless 

 May Beetles, R. A. Yick- 

 ery and T. S. Wilson 666 



A Source of Confusion in 

 the Diagnosis of Nosenia 

 apis in Adult Bees, A. P. 

 Sturtevant 667 



A Revision of the Chalcid 

 Flies of the Genus Harmo- 

 lita of America, North of 

 Mexico, W. J. Phillips and 

 W. T. Emery 667 



Changes in Food Value of 

 Vegetables Due to Cook- 

 ing, M. C. Denton 667 



U. /S. Department of Agriculture — Con. 



Scientific Contributions — Con. page. 



Contributions to the Physi- 

 ology of Phosphorus and 

 Calcium Metabolism as 

 Related to Milk Secretion, 

 E. B. Meigs, N. R. Blath- 

 erwick, and C. A. Cary 678 



Bacterium abortus Infection 

 of Bulls. J. M. Buck, G. T. 

 Creech, and H. H. Ladson_ 683 



Effects of Heat on Trichinse, 

 B. H. Ransom and B. 

 Schwartz 684 



Progress Report on Run-off 

 Investigations on Third 

 Creek, Iredell County, 

 H. M. Lynde 686 



Hydraulic Efficiency of a 

 Drainage Ditch for Five 

 Different Channel Condi- 

 tions, C. E. Ramser 687 



Ultramieroscopic Examina- 

 tion of Disperse Colloids 

 Present in Bituminous 

 Road Materials, E. C. E. 

 Lord 688 



Efficiency of Bituminous 

 Surfaces and Pavements 

 under Motor Truck Traf- 

 fic, P. Hubbard 688 



Rainfall Influence on Du- 

 rability of Zinc - treated 

 Crossties, C. H. Teesdalo 

 and S. W. Allen 690 



Some Points Brought Out by 

 Successive Surveys of the 

 Same Farms, H. W. Haw- 

 thorne 693 



