CONTENTS. 9 



PAGE 



The use of the Zeiss immersion refractometer in the detection of 



watered milk, 148 



Mahiutrition, 154 



CaHco or mosaic disease of cucumber and melon, .... 163 

 Notes on the occurrence of fungous spores on onion seed, . .164 



Plant breeding studies in peas, 168 



Character of variation in peas, 168 



Differences in variability, 169 



Correlation coefficients, 171 



Correlation of characters, 171 



Heredity in peas, 172 



Coefficients of heredity, 172 



Prepotency, 172 



The Ben Davis group of apples, 176 



Description of varieties, 177 



Variation in apples, 194 



Variation in the college orchard, 194 



(a) From different trees, 195 



(b) From different parts of the trees, 196 



Climatic A-ariations, 197 



Discussion of the variation, 197 



Variability of the different lots, 203 



Causes of the variation, 210 



Summary, 212 



Fumigation dosage, 214 



I. Tomatoes, . 214 



Introduction, 214 



Comments and conclusions, 225 



11. Cucumbers, 227 



Introduction, 227 



Comments and general conclusions, 246 



