Contributions to the Knowledge of the Life History of Pinus With Special Referen
Contributions to the Knowledge of the Life History of Pinus With Special Referen
Margaret Clay Ferguson
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X 1*400. Pinus Strobus. 15. A still more advanced stage in the fusion of the threads. Practically all evidence of the earlier longitudinal fission has now disappeared. X 1*400. Pinus Strobus. 16. The chromosomes becoming apparent. X 1*400. Pinus Strobus. 17. Distinct chromosomes, in the one half or reduced number, arising from the contracted and more or less anastomosed skein. X 1, 400. Pinus Strobus. 18. A-c. Final stages in the formation of the chromosomes, showing the separation of the segme...nts from one another, and also the relation of some of them to the nucleolus. X 1*400. Pinus Strobus. 19. A-l. Various forms of chromosomes observed before the organization of the spindle. Each chromosome consists of two of the longitudinal split segments which were formed immediately subsequent to synapsis. X 1 5400. Pinus Strobus. 20. The chromatic segments completely differentiated. The remnant of a nucleolus is still present, and the nuclear membrane is being resolved into threads. X 1*400. Pinus Strobus.
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