April 1892.J THE BOTANICAL SOCIETY OF EDINBURGH. 427 



elements, cJir.; dark nuclear substance, 1; pale peri- 

 nucleolar area, 2; nucleolus, 7i.ll.; endonucleolus, end.; 

 paranucleoli, ^A «. ; degenerated paranucleoli, m? 



Fig. 33. Two nuclei have met obliquely, but are as yet separated 

 from one another by the nuclear membrane which forms 

 a septum, .s\ 



Fig. 34. The two perinucleolar areas have approached one another 

 at "/" 



Fig. 35. The perinucleolar areas have fused, 2. Two paranucleoli 

 lying in close contact, probably about to fuse, }?. ? 



Fig. 36''*"'^. The nucleolar membranes are touching, and then the 

 two nucleoli fusing. [Lower half of fig. 36^ has simply 

 been sketched.] 



Fig. 37. A nucleolus with kidney-shaped endonucleoli. 



In Figs. 37—43 the nucleolar membrane of the antipodal nucleolus 

 is seen as an empty bag, 7i. b. 



In Fig. 38, two bodies, the nature of which is questionable, are 

 shown, X and y. x = perhaps a vacuole. 



Fig. 39. A pale streak. A; rumaing from the nucleolus towards the 

 directing bodies, dir. bod. ? 



Figs. 40, 41. Several questionable bodies ? and dr. b. 



Fig. 40^ is a nucleolus containing a series of endonucleoli arranged 

 as the beads of a rosary. 



Fig. 42'^ represents a nucleolus, with a nucleolar membrane, 1; a 

 peripheral densely-stained portion, 2; a corona of small 

 endonucleoli, J; a larger endonucleolus, 5, lying above, 

 i.e., outside the central endonucleolus. 



Fig. 43^^. A nucleolus with a nucleolar membrane, n. I. m., radiating 

 fibrils, r. /. in a peripheral paler zone of the nucleolus ; 

 four comparatively large endonucleoli, x.; a set of proxi- 

 mal or coronal endonucleoli, j^^'ox. end., and a fold, fold, 

 around the central endonucleolus, c. end. 



Fig. 44^ A diagrammatic representation of the various layers of a 

 nucleolus : 1, a nucleolar membrane ; 2, a peripheral set 

 of small endonucleoli; S, an apparently homogeneous 

 layer ; 1)., the corona of small endonucleoli surrounding 

 the large central endonucleolus, 5. 



Figs. 45-47 illustrate the conjugation of the two nuclei in Scilla 

 nutans. We see a nuclear membrane, n. m., with broad, 

 p. a, and narrow, j^- /3, pores ; peripheral chromosomes, 

 chi-.^, and central ones, cJir.^; nuclear hyaloplasm, n. h., 

 with tubular fibrils, n.f., and solid strands, n.f.-. 



The nucleolus fig. 45, 47, exhibits a nucleolar mem- 

 brane, n. m. and 1; a peripheral set of endonucleoli, 

 fig. 45, 2, 47, p. n.; aground substance, S; endonu- 

 cleoli, j^; and radiating fibrils, fig. 45, 5. 



