An Apple Orchard Survey of Ontario County 167 



Page 



Fertilizers ig6 



General practice 196 



Relation of fertilizers to yield and income 197 



Stable manure 198 



Correlation of quantity and frequency of application 198 



Relation of quantity and frequency of application to yield 



and income 198 



Orchard pests and diseases 199 



Spraying 200 



General practice 200 



Relation of spraying to yield and income 202 



Simimary of the survey 203 



Appendix — Part 1 206 



Tables for 1907 and 1908 206, 207 



Appendix — Part II. Statistical methods as applied to orchard 



surveys 208 



General theoretical considerations 208 



The principles underlying statistics 208 



Law of probability and normal distribution 208 



Averages 209 



Measure of variability 209 



Comparison by percentages 210 



The orchard survey from the statistical standpoint 210 



Bibliography 214 



