Content introduced in brief Preface Part one General outline 1 Introduction 1.1 Natural background of secondary xylem development 1.2 The source, formation and content of the ideas of developmental studies of secondary xylem 1.3 Theoretical basis of experimental measures adopted in the studies for affirming the existence of secondary xylem development 1.4 Originality of studies of secondary xylem development 2 Experimental measures, materials and data processing 2.1 Determination 2.2 Factors to make choice of experimental material 2.3 Experimental materials 2.4 Determining the formation time of sampling position in secondary xylem 2.5 Data processing 3 That developmental phenomenon exists during secondary xylem life is proved by diagram 3.1 The diagrammatic conditions and necessity of secondary xylem development 3.2 The features of development diagram of two directional growth ages of secondary xylem 3.3 The technical terms related to ordinal numbers offing positions in secondary xylem 3.4 Explanation of four types of figures in this book 3.5 The general explanation of appendant tables 3.6 Data in appendant tables were applied to drawing figures Part two Effect of relative disciplines and progress obtained in their application 4 The views related to development concept in biology and progress obtained in their application 4.1 Review on development concept in biology （Ⅰ） The features related to development 4.2 Review on development concept in biology （Ⅱ） The philosophical concept of developmental dynamics 4.3 Review on development concept in biology （Ⅲ） Some biological doubts relative to development 4.4 Consultation about developmental concept 4.5 Common nature of organisms' development 4.6 Secondary xylem meets the requirements for the experimental material of the study on determining the commonness of organism's development Cited Literature 5 The effect of botany and its progress obtained in application 5.1 Tree development 5.2 Expansion of comprehension about tree development 5.3 Theoretical progress in tree growth obtained in this project 5.4 The differences between the study of botany on tree growth and this project on secondar xylem development 6 The effect of wood and forest science and their progress obtained in application. 6.1 Secondary xylem is unchanged relic fixed throughout change process 6.2 Growth sheath 6.3 Two directional growth ages 6.4 Trait, time and position in developmental change of secondary xylem 6.5 Discrimination of technical terms in this chapter 6.6 Progress of wood and forest science in development studies of secondary xylem 7 The effect of genetics and its progress obtained in application 7.1 Cytology and genetics results that possess important effects on development studies of secondary xylem（Ⅰ） Genetic material 7.2 Cytology and genetics results that possess important effects on development studies of secondary xylem（Ⅱ） replication and recombination of genetic material 7.3 Genetics results that possess important effects on development studies of secondary xylem（Ⅲ） Genetic trait, acquired character, regulation and control of developmental trait 7.4 Tree under view point of genetics 7.5 Secondary xylem under the viewpoint of genetics 7.6 Discrimination and analysis of technical terms 8 The effect of evolutionary biology and its progress obtained in application 8.1 The evolution concept that have important effects in development studies 8.2 Mutation phenomenon and evolutionary relationship of secondary xylem among tree species 8.3 Dynamics of adaptation 8.4 Tree adaptation formed in evolution 8.5 Evolution and fimctionary adaptation of secondary xylem and its component cells 8.6 Conclusion Part three Experimental proof 9 Developmental change of tracheid morphology of secondary xylem （Ⅰ） Tracheid length 9.1 Research results of correlative disciplines about tracheid length 9.2 Cogitation upon tracheid length research in this project …… Part four General review Addendum Plate
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