TABLE OF CONTENTS. 



Page. 



Letter of transmittal 7 



Letter of submittal 9 



PART I. PEACH YELLOWS. 

 I. Introductory : 



(1) Destructive nature of yellows 11 



(2) Characteristics of the disease 12 



II. Inoculations : 



Experiment 1. The Barnard trees 16 



Experiment 2. The Shallcross trees -18 



Experiment 3. The Nicholson trees 21 



Experiment 4. The Barnard trees 21 



Experiment 5. The Department trees 22 



III. Excisions : 



A. Orchard of William Brothers, Dover, Delaware 24 



B. Orchard of James W. Green, Magnolia, Delaware 25 



C. Orchard of George Gildersleve, 'Rising Sun, Delaware 27 



D. Orchard of John A. Nicholson, Leipsic, Delaware 2? 



E. Old orchard of George Davis, Still Pond, Maryland 28 



F. Young orchard of George Davis, Still Pond, Maryland 29 



G. Orchard of F. H. Harper, Still Pond, Maryland 29 



IV. Observations and experiments bearing 011 immunity : 



(1) Are trees from healthy localities exempt ? 38 



(2) The Kerr trees (peach on plum) 38 



(a) Plantation in Mr. Greene's orchard 40 



(&) Plantation in Mr. Harper's orchard 40 



fc) Plantation in Dr. Maxwell's orchard 41 



(3) Stones from Persia 42 



(4) Yellows in old trees 42 



V. Conclusions : 



Facts established 43 



Hypotheses rendered probable 44 



Inquiries suggested 45 



PART II. PEACH ROSETTE. 

 I. Introductory : 



(1) Plants attacked 45 



(2) Characteristics of the disease 45 



(3) First appearance and present distribution 48 



II. Inoculations : 



Experiment 1. The Husted trees , 49 



Experiment 2. The Husted trees (peach on plum) 52 



III. Conclusions 54 



Explanation of plates. 55 



Index 59 



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