CONTENTS 



PAGE 



Survey of literature 46 



Material used in these experiments 50 



Magnitude of the first and of the June drop 50 



Flowers developing into fruits after the first drop 51 



Spurs setting fruit after the first drop ; 52 



Variations in percentage of spurs setting fruit after the first drop 53 



Flowers developing into fruits after the June drop 54 



Totals of flowers on many limbs 54 



Flowers falling at the first drop and at the June drop on fruit-bearing 



spurs 55 



Spurs setting fruit after the June, drop 56 



Consideration of spurs from many limbs 56 



Variations in percentage of spurs setting fruit after the June drop 56 



Relation between amount of bloom and set of fruit 58 



Set of fruit on limbs with large leaves and on limbs with small leaves 58 



Set of fruit as influenced by the location of the spur on the twig growth of different 



years . 59 



Set of fruit on spurs formed on different parts of a given year's growth 62 



Relation between numVjer of flowers to the spur, and ability of the spur to set fruit . . 63 



Average number of flowers on spurs holding fruit for varying lengths of time. . 63 



Set of fruit on spurs with varying numbers of flowers 64 



Percentage of flowers developing into fruits on spurs producing varying num- 

 bers of flowers 64 



Relation between length of spur growth made during preceding season, and fruit- 

 fulness of the spur 65 



Relation between weight of the flower-bearing spur and its fruitfulness 67 



Weights of setting and of non-setting spurs 67 



Set of fruit on spurs of different weights 68 



Weights of spurs holding fruits for varying lengths of time 68 



Relation between weight, or vigor, of the fruit-bearing spur, and number of 



fruits borne by it 69 



Relation between weight of the spur and number of flowers to the spur 70 



Relation between weight of the spur and length of the previous season's growth .... 71 

 Relation between weight of the new spur growth and diameter of the conducting 



tissue 72 



Relation between diameter of conducting tissue and weight of spurs, from limbs 



having a light bloom and from those having a full bloom 73 



Relation between water supply, leaf area, and pushing of buds 74 



Relation between amount of lateral growth from the flower-bearing spur, and 



fruitfulness of the spur 76 



Relation between sap supply and fruit setting 78 



Fruit setting as influenced by varying amounts of leaf surface on the flower-bearing 



spur 81 



Influence of sunlight on the setting of fruit 83 



Relation between seed formation and fruit development 84 



Number of seeds in fruit that sets and in fruit that drops 85 



Relation between number of seeds and size of fruits 86 



Size of fruit constant, number of seeds varying 87 



Weight of spur constant, number of seeds varying 87 



Weight of spur constant, number of seeds constant, size of embryo 



varying 89 



Number of seeds and seed value .' 91 



Relation between seed value, weight of spur, and set of fruit 92 



Observations concerning some of the physiological effects of seeds 95 



Withdrawal of water by leaves from fruits with varying numbers of seeds .... 95 

 Depression of freezing point by sap from fruits with varying numbers of 



seeds 96 



Relation between formation of seeds and symmetrical development of fruit. . , 98 



^S7 



