INTERPRETATIONS OF MEIOTIC PHASE 43 



lished observations of the latter band of workers suggests 

 very strongly that they have missed a stage which has been 

 described by the others. Besides this, a much wider field has 

 been covered by the adherents of the first interpretation. 

 It therefore seems probable, that in the majority of animals 

 and plants two chromosomes are joined end-to-end to form 

 the loops, and that whole chromosomes are distributed to 

 the daughter cells. Supposing the other interpretation to 

 be correct in some cases, there would still appear to be 



FJG. 17. Showing the parallel joining of the chromosomes and their subsequent 

 distribution to the daughter cells in the meiotic (reducing) division, accord- 

 ing to the Louvain School. 



an alternative distribution of morphological entities to the 

 gametes. According to this interpretation the two chromo- 

 somes are joined together side by side, as shown in Fig. 17, a. 

 Some of the upholders of this theory state that at the 

 meiotic division the two chromosomes are drawn apart and 

 distributed whole to the daughter cells. Here we have the 



males dans Batrocoseps attenuatus," La Cellule, xxii., 1905; Van Molle", J., 

 " Les Spermatocytes dans I'Ecureuil," La Cellule, xxiv., 1907 ; Schreiner, A. and 

 K. E., " Uber die Entwicklung der mannlichen Geschlechtszellen von Myxine 

 glutinosa (L.)," Archives de Biologic, xxi., 1905; " Neue Studien Uber die 

 Chromatmreifung der Geschlechtszellen": (1) "Die Reifimg der mannlichen 

 Geschlechtszellen von Tomopteris onisciformis (Eschscholtz)," Arch, de Bio- 

 logic, xxii., 1906; (2) "Die Reifimg der mannlichen Geschlechtszellen von 

 Salamandra maculosa (Laur.), Spinax niger (Bonap.) und Myxine glutinosa 

 (L.)," Arch, de Biologic, xxii., 1906; (3) "Die Reifung der Geschlechtszellen 

 von Ophyotrocha puerilis (Clprd-Merz.)," Anatomische Anzeiger, xxix., 1906. 



