Nucleoli During- the Oogenesis of the Dragou-fly. 229 



Fig. 35 — 36. Chromatic reticulum formiug. Blending of oxyphile 

 and basiphile substances in the nucleolus. 



Fig. 37 — 38. Large vacuole in the oxyphile body with chromatic 

 reticulum inside. Nucleus again being filled with chromatic reticulum. 



Plate 16. 

 (Anar Junius.) 



Fig. 39 — 42, 44, 50 and 52 are from cells stained with iron-haema- 

 toxylin. 



Fig. 43, 45 — 49 and 51 are from cells stained by the method of Obst. 



Fig. 39. Longitudinal section through the end -filament, germinal 

 area and a portion of the growth area. Showing : (/ peritoneum ; b follicle 

 cell ; c end-filament cell ; d elongated filament-cell ; r germ cell with chromatin 

 gathering into a spireme ; g degenerating nucleus ; h germ cell with chro- 

 matin in a reticulum. 



Fig, 40. Longitudinal section of a portion of the growth area: a end 

 of germinal area; b follicle cell; c yolk-nucleus; d oxyphile nucleolus; 

 c basiphile nucleolus; /" basiphile nucleolus breaking up into a spireme. 



Fig. 41. Cross-section of growth area showing condensation of chro- 

 matin around the nucleolus. 



Fig. 42. Wrapping up of chromatic spireme. 



Fig. 43. Chromatin still in a reticulum. Two oxyphile nucleoli 

 present. 



Fig. 44. Cross-section of the growth area. Note how similar the 

 wrapping up of the chromatic spireme is to synapsis in spermatogenesis. 



Fig. 45. Fine spireme. 



Fig. 46. Coarse spireme. 



Fig. 47. Condensation of the spireme. 



Fig. 48. Further condensation of the spireme around the oxyphile body. 



Fig. 49. Chromatin condensed and forming with the oxyphile nucleolus 

 a double nucleolus. 



Fig. 50. Scattering of the yolk-nucleus through the cytoplasm: 

 a, a layer of chromatin just within the nuclear membrane. 

 Fig. 5L Basiphile nucleolus beginning to loosen. 

 Fig. 52. The process continuing. 



Plate 17. 

 {Anax junkis.) 



Fig. 53—56, 60 and 62 — 63 are from cells stained with iron- 

 haematoxylin. 



Fig. 57 — 59 and 61 are from cells stained by the method of Obst. 



