CONTENTS. 7 



Department Bulletin No. 813. — Cithus-fruit Improvement: A Study 



OF Bud Variation in the Eureka Lemon — Continued: ''"ge- 



Descriptions of the important strains 13 



Eureka strains 13 



Small-open strain 15 



Shade-tree strain 16 



Dense-unproductive strain 19 



Pear-shape strain 20 



Dense-productive strain 21 



Variegated strain 21 



Sporting strain , 22 



-Lessons taught by these investigations 23 



Presentation of data 25 



Comparative value of the strains 78 



The unintejntional propagation of undesirable strains 79 



The isolation of strains through bud selection 80 



Top-working undesirable trees 81 



Replacing undesirable trees in bearing orchards 84 



The selection and care of bud wood 85 



Summary 87 



Department Bulletin No. 814. — The Standard Day's Work in Cen- 

 tral Illinois: 



Introduction 1 



Summary of residts 2 



General conditions 3 



Plowing 4 



The disk harrow 9 



The spike-tooth harrow 10 



Planting corn 11 



Cultivating corn 12 



Cutting corn 14 



Husking corn ". 17 



Seeding grain 19 



Harvesting grain 21 



Unloading grain 23 



Haying operations 23 



Hauling and spreading manure 29 



Comparison of Illinois and New York practices 30 



Department Bulletin No. 815. — Citrus-fruit Improvement: A Study 

 OF Bud Variation in the Lisbon Lemon: 



Importance of the lemon industry 1 



History of the Lisbon lemon variety 2 



Variability within the variety 3 



Objects of the investigations 3 



Plan of the investigations 4 



Methods of keeping performance records 5 



Descriptions of the important strains 6 



Lisbon strain 6 



Open strain 7 



Dense-unproductive strain 8 



Bull strain 9 



Variegated strain 10 



Sporting strain .-■ 10 



Lessons taught by these investigations 11 



Presentation of data ■ 12 



Comparative value of strains 62 



The unintentional propagation of undesirable strains 63 



The isolation of strains through bud selection 64 



Top-working undesirable lemon trees 64 



Replacing undesirable trees in bearing orchards 67 



The selection and care of bud wood 68 



Summary 69 



