11 CONTENTS. 



PAGE 



VII. Comparative morphology of primary lymph sacs, lymph hearts, 



lymph glands and amphibian lymph sacs 70 



VIII. Various other theories in regard to the origin and development 



of the lymphatic system 72 



1. Mayer-Lewis Anlagen 72 



2. Extra-intimal and perineural spaces and fenestration 75 



3. Growth of lymphatics by the addition of tissue spaces 77 



IX. Conclusions 82 



X. Literature 83 



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