Mineral requirements for the growth of dairy heifers 272 



Two systems of dairy cattle feeding — high roughage and low grain v. low 



roughage and high grain 273 



The chemical composition of grass from plots fertilized and grazed intensively 273 



Department of Pomology: 



The interrelation of stock and scion in apples 274 



Tree characters of fruit varieties 274 



The genetic composition of peaches 274 



Testing methods of pruning 275 



Effect of pruning on bearing apple trees 275 



Comparison of cultivation and sod in a bearing orchard 275 



Comparison of clover sod and grass in sod multh orchard 275 



Tests of different amounts of nitrate of soda 275 



Comparison of cultivation and heavy mul(hing for apples and pears 275 



The effects of fertilizer limitation on fruit plants 276 



Role of potash and lime in fruit tree nutiition 276 



Effect of potash and lime on apple trees . 276 



Study of varieties of tree fruits 276 



Fruit bud formation in the strawberry 276 



Bud mutations among apples and other fruits 277 



Light pruning of young grape vines 277 



Work not on a project basis: 



The "set" of Mcintosh apples in Middlesex and Worcester counties 277 



Blueberry culture 277 



A study of the storage of Mcintosh under various conditions 277 



Test of spray materials 277 



Studies of arsenical residue on apples 278 



Cross-pollination and sterility studies with certain apple varieties 278 



Pruning of Northern Spy trees 278 



Department of Poultry Husbandry: 



Broodiness in poultry 278 



Breeding poultry for egg production 278 



Statistical study of heredity in Rhode Island Reds 279 



A genetic study of Rhode Island Red color 279 



Determination of genetic laws governing results in inbreeding poultry 279 



Heredity and environmental characteristics affecting variability in egg pro- 

 duction 279 



Factors affecting egg weight and shell character in domestic fowl 279 



Relation of intensity or rate of laying to feather pigmentation 279 



Department of Veterinary Science: 



Poultry disease elimination law 280 



Laboratory service — pathology 280 



Farm and Station Bang's disease 281 



Infectious trachitis in poultry 281 



The Waltham Field Station: 



The plant house 281 



Electric hotbed 282 



"Vegetable variety trials 282 



Conditions affecting the production and vegetative propagation of Washing- 

 ton asparagus 282 



Greenhouse lettuce 283 



Improvement of vegetable varieties through root and seed selection 283 



Perennial ornamentals 283 



Field Day 283 



Cooperative Tobacco Investigations: 



Brown root-rot _ 284 



Black root-rot 284 



Mosaic 284 



Publications 284 



Changes in staff, December 1, 1929, to November 30, 1930 289 



