CONTENTS 



Department Bulletin No. 276. — The Pea Aphis with Relation to Forage 

 Crops: Page- 

 Introduction 1 



Identity of the species occurring in America 4 



Past history of the pest and its injuries 5 



Character of attack 7 



Effects on cattle of feeding them infested clover 7 



Distribution and origin 8 



Food plants 9 



Description : 12 



Life history. % 26 



Field observations 26 



Generation experiments 27 



Hatching of the egg 43 



Molting 43 



Age at which females begin reproducing 45 



Reproductive period 49 



Longevity 49 



Fecundity of viviparous females 49 



Sexual forms 50 



Fecundity of oviparous females 51 



Natural control 52 



Methods of artificial control 54 



Department Bulletin No. 277. — Cotton Warehouse Construction: 



Introduction 1 



Importance of storage houses 2 



Principles of storage 3 



Explanation of the term "standard " as applied to cotton warehouses '. 7 



Types of standard warehouses 7 



Miscellaneous fire insurance schedules 27 



General consideration relating to cotton storage and fire insurance 28 



Conclusions 37 



Department Bulletin No. 278. — Miscellaneous Insecticide Investiga- 

 tions: 



Introduction 1 



Experiments, 1912 1 



Experiments, 1913 11 



Experiments, 1914 19 



Field experiments 27 



Summarized review 38 



Conclusions 42 



Key to tables 43 



Department Bulletin No. 279. — Single-stalk Cotton Culture at San 

 Antonio: 



Introduction 1 



Cotton production in the San Antonio region 2 



Plan of test 3 



Planting and germination of seed 4 



Chopping wide-spaced rows 5 



Thinning single-stalk rows 5 



Results of the test 5 



Development of vegetative branches 6 



Flowering records 7 



Number of bolls set 11 



HI 



