CONTEXTS 
Page. 
Introduction 7 
Part I. Culture and uses 7 
Natural requirements 7 
Propagation 8 
Transplanting large trees 9 
Irrigation 10 
Fertilizers 10 
Pruning and change of sex 10 
Thinning the fruits 11 
Artificial feeding 11 
Renewing the plantings 11 
The fruit crop 11 
Varieties 12 
The papaya as a food 13 
Medicinal and other uses 15 
Papain 16 
Collecting and preparing the juice : 17 
Part II. Breeding of papaya 18 
Botanical names 18 
Common names 18 
Botanical relationships 19 
Descriptions of forms of papaya 19 
Summary of forms 23 
Significance of the forms 25 
Change of sex 25 
The female in sex change 27 
Inheritance of change of sex 28 
Origin of different forms 28 
Origin of the dioecious Carica papaya 31 
Breeding within the dioecious forms 32 
Breeding the hermaphrodite forms 34 
Hermaphroditism in Lychnis dioica 35 
Breeding within the andromoncecious forms 36 
Crossing the different forms 36 
Possibilities and limitations 36 
Combining dioecious with hermaphrodite forms 38 
Stocks not showing any fertilization 40 
Parthenocarpy 40 
Parthenogenesis 41 
Hybridization of Carica 41 
An attempt to breed a hermaphrodite papaya 42 
Ideals in breeding the papaya 42 
Insect pests. By D. T. Fullaway 44 
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