82 ANNUAL REPORT, 1935 



325 Poultry Flock Improvement. J. C. Graham. 8 pp. illus. October 1935. 



The purpose of this project was to determine whether it is possible to maintain or im- 

 prove body weight, feather color, egg production factors, hatchability, and size, shape, 

 and color of eggs, through the annual introduction of new blood from reliable sources but 

 without pedigree breeding. The results show that this is possible, and that success will 

 depend on the following factors: 



1. The care with which the foundation flock is selected. 



2. The ability to obtain new blood that will raise the level of the factors sought. 



3. The elimination of undesirables before the breeding season begins. 



4. The persistency with which the details of the program are followed. 



The cost of this method of flock improvement is insignificant compared with the cost of 

 pedigree breeding, as 300 eggs purchased annually will supply breeding males for a flock 

 of 750 females and will also add a possible 100 to 125 quality pullets to the flock. 



326 Naphthalene as a Greenhouse Fumigant. W. D. Whitcomb. 32 pp. 

 illus. December 1935. 



Naphthalene fumes may be used to kill certain greenhouse pests, particularly the common 

 red spider, which are not controlled by the standard fumigating materials containing nico- 

 tine or hydrocyanic acid gas. Experiments in the greenhouse at the Waltham Field Station 

 furnish the basis for specific information regarding the action of naphthalene fumes on 

 various insects and plants, the conditions under which greenhouse fumigation with naph- 

 thalene is both safe and effective, estimates of cost, and directions for fumigating. 



Control Bulletins 



77 Seed Inspection. F. A. McLaughlin. 66 pp. February 1935. 



78 Fifteenth Annual Report on Eradication of Pullorum Disease in Massa- 

 chusetts. Poultry Disease Control Laboratory. 12 pp. July 1935. 



79 Inspection of Commercial Feedstuffs. Philip H. Smith. 56 pp. Sep- 

 tember 1935. 



80 Seed Inspection. F. A. McLaughlin. 66 pp. November 1935. 



81 Inspection of Commercial Fertilizers. H. D. Haskins. 48 pp. December 

 1935. 



82 Inspection of Agricultural Lime Products. H. D. Haskins. 8 pp. 

 December 1935. 



Meteorological Bulletins 



553-564, inclusive. Monthly reports giving daily weather records, together 

 with monthly and annual summaries. C. I. Gunness. 4 pp. each. 



Reports of Investigation in Journals 



(Numbered Contributions) 

 175 The Toxicity of Aluminum on Seedlings and the Action of Certain Ions 



in the Elimination of the Toxic Effects. Walter S. Eisenmenger. Plant 



Physiol. 10 (No. 1): 1-25. 1935. 

 186 The Distribution of Roots in Porous and Non-Porous Plant Containers. 



Linus H. Jones and Henri D. Haskins. Plant Physiol. 10:511-519. 1935. 

 188 The Phosphorus Requirement of Dairy Heifers. J. G. Archibald and E. 



Bennett. Jour. Agr. Research 51:83-96. 1935. 



197 The Relative Precipitating Value of Alcohols on Protein Solutions. 

 Walter S. Eisenmenger. Kolloid-Zeitschrift 70 (1): 94-96. 1935. 



198 Vitamin C Content of Twenty-One Massachusetts Grown Varieties of 

 Apples. George G. Smith and Carl R. Fellers. Amer. Soc. Hort. Sci. 

 Proc. 31. 89-95. 1934. 



199 Effect of Fertilization, Freezing, Cooking, and Canning on theVitamin 

 C and A Content of Asparagus. C. R. Fellers, R. E. Young, P. D. Isham, 

 and J. A. Clague. Amer. Soc. Hort. Sci. Proc. 31:145-151. 1934. 



