I 



Studies on Synapsis. 



79 



gated, and provides no sanction for the view that the plasmosome is in any 

 way connected with the chromatinic organisation of the nucleus : its relation 

 to yolk formation is indicated. 



(8) Data relating to the transmission of material from nucleus to cyto- 

 plasm are discussed in their bearing on " chromidia " and secondary 

 " nuclei " ; it is submitted that the origin of the latter in no way involves 

 a revision of the view that the chromatin organisation of the nucleus retains 

 its integral continuity throughout the growth phase. 



This research was carried out in Prof. MacBride's laboratory. Acknow- 

 ledgment is made to Mr. P. V. Isaac, B.A., who rendered invaluable 

 assistance in cutting sections and securing material, and to Prof. E. W. 

 MacBride, F.E.S., for kindly reading through the MS. 



BIBLIOGRAPHY.* 



(1) Arnold, 1909 : " The Prophase in the Ovigenesis and Spermatogenesis of Planaria," 



' Arch, f. Zellforsch.,' vol. 3. 



(2) Harman, 1920 : " Cliromosonie Studies on the Tettigidse II," 'Biol. Bull.,' vol. 38. 



(3) McGill, 1904-7: "The Spermatogenesis of A/iax Juniv^," 'Univi Missouri Stud.,' 



vol. 2, p. 5 ; " The Behaviour of the Nucleoli during the Oogenesis of the Dragon- 

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(4) Lefevre and McGill, 1908 : "The Chromosomes of A/iasa tristis and Anax junivA^ 



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(6) Hogben, 1920 : " Studies on Synapsis I and II," ' Roy. Soc. Proc.,' vol. 91 ; " The 



Problem of Synapsis," I'Journ. Roy. Micr. Soc.,' 1920. 



(7) Carleton, 1920 : " On a New Intranucleolar Element," 'Q.J.M.S.,' vol. 62. 



(8) Schaffer, 1920 : " A Comparative Study of the Chromosomes in Lachnosterna," 



' Biol. Bull.,' vol. 38. 



(9) Bolles Lee, 1912 : " La Structure des Chromosomes et du noyau au repos," ' La 



Cellule,' vol. 28. 



(10) Dehorne, 1911 : " Recherches sur la division de la Cellule," ' Arch. f. Zellforsch.,' 



vol. 6. 



(11) Fraser and Snell, 1911 : "The Vegetative Divisions of Yicia fabia," 'Ann. Bot.,' 



vol. 25. 



(12) Gates, 1912 : " The Somatic Mitoses of CEnothera," ' Ann. Bot.,' vol. 26 ; " The 



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(13) King, 1908 : " The Oogenesis of Bufo lentiginosv^," ' Journ. Morph.,' vol. 19. 



(14) Jorgensen, 1913 : " Zellenstudien," ' Arch. f. Zellforsch.,' vol. 10. 



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(16) Buchner, 1914-18 : "Die Besamung, usw., bei Saccocirrus," 'Arch. f. Zellforsch.,' 



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* Work cited in previous papers of this series is not referred to in the above list. 



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