8 DEPARTMENT OF AGEICULTUEE BULS. 176-800. 



Department Bulletint No. 794. — Waierfowl and Their Food Plants in 

 THE S.\ndhill Region of Nebraska — Continued. 



Part I. — Waterfowl in Nebraska — Continued: Page. 



General description of the sandhill region 10 



Annotated list of birds 22 



Game birds 22 



Nongame birds 31 



Part II. — Wild-duck foods of the sandhill region of Nebraska: 



Introduction .♦. 37 



Improvement of the wild-duck food supply 38 



Effect of alkaline conditions on duck-food plants 38 



List of plants of the sandhill lakes 40 



List of lakes ^d^ited .' 40 



Publications relating to waterfowl and their food plants 79 



Department Bulletin No. 795. — The Adulteration of Insect Powder 

 waTH Powdered Daisy Flowers (Chrysanthemum Leucanthemum 

 L.). 



Adulteration of insect powder 1 



Uses for Ckrysanthemum Leucanthemum , 2 



Insecticidal action of Chrysanthemum, Leucanthemum 3 



Chemistry of Chrysanthemum Leucanthemum 3 



Morphology of Chrysanthemuyn Leucayithcmum 6 



Summary 10 



Literature cited 11 



Department Bulletin No. 796. — Use of Toxic Gases as a Possible Means 

 of Control of the Peach-tree Borer. 



Introduction 1 



Experimental procedure 2 



Experimental results 3 



Miscellaneous gases 3 



Para-chlorobenzene 4 



Department Bulletin No. 797. — Commercial Dutch-bulb Culture in 

 the United States. 



Bulb production in the United States 1 



Soil adaptation 3 



Temperature, soil, and fertility requirements 4 



Number of bulbs grown per acre 5 



Planting 6 



Depth of planting 9 



Treatment after flowering 10 



Roguing 10 



Harvesting the flowers 11 



Cultivation 11 



Harvesting the bulbs 13 



Storing and curing 14 



Cleaning 18 



Sizing 20 



Advantages of sizing 22 



Culling. 22 



Propagation 23 



Determination of flowering quality 2S 



Packing bull:)S 28 



Shipping bull:)S. 28 



Bulb growing for pleasure 29 



Miscellaneous bulbs 33 



Bulb pests 33 



The best varieties to plant 36 



Varieties of narcissi 37 



Varieties of tulips 41 



Varieties of hyacinths 46 



Bulb literature 47 



Definitions 47 



