CONTENTS. 



Department Bulletin 121. — Spinning Tests of Upland Long-staple Cot- 

 tons: Pa § e - 



Introduction 1 



The varieties tested 3 



Soil types represented 4 



Variations in grade and staple 5 



Differences in length of staple 6 



The invisible loss 6 



Card waste 7 



Relation of grade to waste 7 



Comparison at the comber 9 



Comber tests with wide settings 10 



Number and uniformity of tests 11 



Details of the tests at the wide setting 12 



Value of waste differences 13 



Accuracy of the machine work 15 



Factors influencing waste 15 



Tests of breaking strength 16 



Cultural characteristics 17 



Comparison of early and late picked cotton 18 



Consumption of staple cotton in the United States and Canada 19 



Conclusions 20 



Department Bulletin 122. — The Inorganic Composition of Some Impor- 

 tant American Soils: 



Introduction 1 



Selection of soil types 1 



Distribution of the rarer elements 2 



Preparation of the sample 4 



Notes on the methods of analysis 5 



Description of the samples 9 



Discussion of the results 14 



Mineralogical composition 16 



Discussion of the mineralogical data 24 



Conclusions 27 



Department Bulletin 123. — Extension Course in Vegetable Foods, for 

 Self-instructed Classes in Movable Schools of Agriculture: 



General suggestions to leaders 1 



Classification of plants 2 



Leaves and stalks 9 



Bulbs 20 



Tubers and roots 24 



Succulent roots 30 



Flowers and fruits 34 



Seeds 41 



Fungi 48 



Condimental vegetable foods, and food accessories 50 



Summary of cookery 54 



Drying, evaporating, and salting vegetables 59 



Preserving and canning vegetables 63 



Pickling vegetables 68 



Vegetables for the table marketing 71 



References 77 



List of apparatus 77 



Department Bulletin 124.— The Alfalfa Caterpillar: 



Introduction 1 



General distribution 2 



Economic history outside the borders of Arizona and California 3 



Economic history in California and Arizona 4 



Description 8 



Life history and habits 10 



Natural checks to the species 19 



The control of the alfalfa caterpillar 29 



Conclusions re^ardina; control 39 



