CONTENTS. 9 



PAGE 



Report of the botanist, 75 



Diseases more or less common during the j'^ear, .... 75 



Report of the entomologist, 77 



Goessraann, Charles A., tribute to, 80 



Studies in milk secretion, 86 



The effect of protein upon the production and composition of 



milk, 86 



The determination of arsenic in insecticides, 122 



Methods, 122 



Iodine method, 124 



New processes, 125 



Practice at Massachusetts station, 127 



Iodine methods for arsenates, 129 



Purification of insoluble fatty acids, 131 



Distillation of the fatty acids in vacuo, 131 



Crystallization from alcohol, 132 



Distillation of the ethyl esters in vacuo, 133 



The soluble carbohydrates in asparagus roots, 135 



Seed work, 1910, 141 



An outbreak of rusts, 144 



Sweet pea troubles, 145 



A spinach disease new to ]\Iassachusetts, 146 



Abnormalities of stump growths, 149 



Description of mosaic disease, 150 



Relation to mosaic disease, 154 



Experiments in inoculation, 154 



Relation of root area to intensity of disease, .... 156 



Chemical tests of abnormal leaves, 157 



Conclusions, 159 



Peach and plum troubles, 161 



Brown rot, scab, gummosis, etc., 161 



Climatic adaptations of apple varieties, .177 



I. Introduction, 177 



II. The causes of varietal variation, 179 



Cultural variation, 179 



Soil variation, 180 



Climatic variation, • . . . 180 



The mean summer temperature, . ■ . . . .182 



III. The development of the apple, 183 



IV. The perfectly developed apple, 186 



V. The individuality of the tree, 194 



VI. The modifying effect of climate on the development of the 



apple, 199 



On form, 199 



On size, 204 



