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UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 697 
Contribution from the Bareau of Plant Industry 
WM. A. TAYLOR, Chief 
Washington, D. C. 
September 27, 1918 
CITRUS-FRUIT IMPROVEMENT: 
A STUDY OF BUD VARIATION IN THE 
MARSH GRAPEFRUIT 
By 
A. D. SHAMEL, Physiologist in Charge, L. B. SCOTT, Pomologist, 
and C. S. POMEROY, Assistant Pomologist, Fruit-Improvement In- 
vestigations, Office of Horticultural and Pomological Investigations 
CONTENTS 
Page 
Introduction 1 
History of the Variety 4 
Variability within the Variety .... 5 
Objects of the Investigations .... 8 
Plan of the Investigations 9 
Methods of Keeping Performance Rec- 
ords 9 
Descriptions of Important Strains . 12 
Infrequent Fruit Variations 18 
Seasonal Fluctuations in Production . 19 
Pag« 
Presentation of Data 20 
Comparative Value of the Strains . . . 106 
The Unintentional Propagation of Unde- 
sirable Strains 108 
The Isolation of Strains 'through Bud 
Selection 109 
Top- Working Undesirable Trees . . .110 
The Selection of Bud Wood Ill 
Summary 112 
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WASHINGTON 
GOVERNMENT PRINTING OFFICE 
191.8 
