4 DEPARTMENT OF AGRICULTURE, BULS. 151-175. 



Page. 



Department Bulletin No. 156. — Wireworms Attacking Cereal and For- 

 age Crops: 



Introduction 1 



Kinds of wireworms 3 



Natural enemies 25 



Remedial measures 29 



Department Bulletin No. 157. — Tillage and Rotation Experiments at 

 Nephi, Utah: 



Introduction 1 



Description of the substation 2 



Experimental work 4 



Summary 43 



Department Bulletin No. 158. — The Nitrogen of Processed Fertilizers: 



Introduction 1 



Base goods a type of processed fertilizer 2 



The chemical examination of base goods 3 



Isolation and identification of definite compounds from the processed fer- 

 tilizer 8 



The chemical changes involved in processing 12 



Availability of the nitrogen of organic fertilizers 19 



The chemical principles underlying the utilization of nitrogenous trade 



wastes 22 



Summary 1 23 



Department Bulletin No. 159. — Soils of the Sassafras Series: 



Definition of the series 1 



Geographical distribution 2 



The North Atlantic Coastal Plain 4 



Sassafras sand 16 



Sassafras loamy sand 23 



Sassafras fine sand 24 



Sassafras gravelly loam 26 



Sassafras sandy loam 28 



Sassafras fine sandy loam 32 



Sassafras loam 34 



Sassafras silt loam 37 



Crop uses and adaptations 44 



Summary 50 



Department Bulletin No. 160. — Cactus Solution as an Adhesive in 

 Arsenical Sprays for Insects: 



Introduction 1 



Experimental work -with cactus 2 



Cactus compared with whale-oil soap as an adl sive 12 



Copper sulphate as a preservative for the cactus 13 



Experiments with other preservatives 14 



The common prickly pear cacti and their chemical composition 15 



Superiority of cactus from dry land 17 



Advantages in the use of cactus as an adhesive 17 



Quantity of cactus to use 17 



Zinc arsenite as an insecticide 18 



Ferrous arsenate as an insecticide 18 



Iron arsenite as an insecticide 18 



Final results from spraying 19 



Recommendations for control 19 



Departmental Bulletin No. 161.— The Mediterranean Fruit Fly in 

 Bermuda: 



Introduction 1 



History of the fruit fly in Bermuda 1 



life history 1 



Host fruits in Bermuda 3 



Possibility of eradication 5 



Bermuda as a source of danger to the United States 6 



Conclusion .• 7 



