xvi LIST OF PLATES 



PAGE 



XIII. I and 2. Mitosis in. the pollen-tube of Tulipa 



3-8. Natural and artificial uncoiling of spirals in Paris and 



Tradescantia ........ 482 



XIV. 1-3. Meiosis in the oocytes of Allolobophora 

 4 and 5. First anaphase in Kniphofia 



6. First metaphase in Mecostethus {^) 



7. Mitosis in the embryo of a fish, Coregonus .... 522 



XV. The centromere at meiosis in pollen mother-cells of Agapanthus, 



Fritillaria, Alstroemeria, Galtonia and Tradescantia . . 540 



XVI. 1-3. Living and fixed spermatocytes of Stenohothrus 



4-7. Ultra-violet photographs of living spermatocytes of 



Melanoplus ........ 564 



