CONTENTS 



PAGE 



Account of experimental work 3 



Materials 3 



Source of inoculum 3 



Plants inoculated 4 



Methods of inoculation 5 



Rubbing 5 



Split-stem method 6 



Grafting 6 



Comparison of different methods 6 



Records 7 



Diagnosis 7 



Recognition and description of different mosaics 7 



Time required for the production of symptoms 11 



Sources of error 12 



Errors of diagnosis 12 



Errors due to accidental contamination 13 



Errors due to the use of ineffective methods 13 



Results of experiments 13 



Interpretation of results 29 



Liability to error 29 



Reliability of numerical results 30 



Inoculations from potato 31 



General results 32 



Conclusions 32 



Summary 32 



References cited 34 



