CONTENTS. 



Department Bulletin No. 940. — The Sporogenes Test as an Index 



of the Contamination oe Milk : Page. 



Present status of the sporogenes test 1 



The Savage method 3 



The Weinzire method 6 



Defects in the sporogenes test 7 



Attempts to improve the characteristic stormy reaction , 9 



Use of 20 c. c. quantities of milk in the sporogenes test 11 



The sporogenes test in relation to milk produced under extreme con- 

 ditions of cleanliness and of filth 12 



Conditions of production of pasteurized milk as indicated by the 



sporogenes; test . 14 



The source of the majority of spores of B. enterltidis sporogenes 



found in milk 16 



Summary and conclusions 19 



Literature cited 20 



Department Bulletin No. 941. — Farm Management in the Ozark 

 Region of Missouri : 



Introduction 1 



Summary 1 



Location and character of the area 3 



Farm business and income 12 



Farm investment 15 



Crops 17 



Crop production and yields 19 



Farm receipts 20 



Farm expenses 20 



Crop management 22 



Live-stock management . 28 



Pasture 34 



The organization and profits of individual farms 40 



Department Bulletin No. 942. — Poisonous Properties of the 

 Whorled Milkweeds Asclepias Pumila and A. Verticillata Var. 

 Geyeri : 



Purpose of paper 1 



Description of Asclepias Pumila 1 



Experimental work with A. Pumila 2 



Typical case of sheep 547 , 3 



Symptoms 5 



Autopsies 7 



Toxic and lethal dosage 9 



Experimental work with A. Verticillata var. Geyeri 10 



Typical case of sheep 473 10 



Symptoms 11 



Toxic dose 13 



Comparative toxicity of stems and leaves 13 



Summary 14 



Department Bulletin No. 943. — Cost of Producing Wheat : 



A problem often misunderstood 1 



Application of cost data to farm organization 3 



Summary of results 3 



Basic factors and cost estimates 4 



Method, scope, and purpose of present study 4 



Geography of production 6 



Comparative wheat yields 11 



Requirements of production 12 



Summary of costs, by districts ^ 13 



Range in cost per acre, by counties 16 



Net cost per bushel 21 



Analysis of items of cost 25 



Array of farms according to cost per bushel, by counties 47 



Cumulative per cent of acreage grown at various costs per bushel 49 



Cumulative per cent of total production 51 



Individual costs per acre . 54 



