Nuclear Division in Funkia. 
397 
Fig. 20. Early synapsis, some of pairs of aggregations show signs of fusing 
to form a smaller number of pairs. (X 1150). 
Fig. 21. Similar stage to the last showing the two large nucleoli common 
in early synapsis. (X 1150). 
Fig. 22. A rare case in whieh the members of each pair of aggregations 
are either almost or quite in contact. The reticulum is still double. (X 1150). 
Fig. 23. A very thin section of nucleus in mid synapsis, showing a few 
pairs of aggregations. (X 1150). 
Fig. 24. A thicker section of the same, in which two pairs of aggregations 
are commonly found in close approkimation. (X 1150). 
Figs. 25 & 26. (Reichert V 12 ) These show the formation of a spireme in 
late synapsis; the chromatin aggregations are being pulled ont to form a thread. 
At the lower right hand corner of Fig. 26, some ragged bits of linin can be 
seen projecting from the chromomeres. (X 1350). 
Fig. 27. A completely formed double spireme, still in synapsis. (X 1150 ... 
Fig. 28. A very thin section of a nucleus such as shown in Fig. 27 ; the 
ragged bits of linin are more clearly seen, and the last stage of the fusion of 
two nucleoli has been arrived at. (X 1150). 
Fig. 29. Double spireme beeoming loosened. (X 1150). 
Figs. 30 & 31. Double spireme fusing to form a single continuous thread, 
all stages of fusion are visible in different parts of the nuclei. (X 1150). 
Fig. 32. A more uniformly distributed continuous spireme. (X 1150;. 
Figs. 33 & 34. Yery thin sections of uniformly distributed spireme, single 
almost throughout: the cut ends seem to be all in the plane of section. (X 1150). 
Fig. 35. First appearance of split in spireme, Segmentation has already 
begun. (X 1150). 
Fig. 36. Segmentation of spireme, some of which is still single. (X 1150). 
Fig. 37. Same stage as last. The two nucleoli have not yet quite fused. 
Plate IX. 
Fig. 38. Segmentation of spireme into nnmerous straight pieces, in which 
the chromomeres but not the linin thread have split. Fine threads are seen 
uniting the pieces. (X 1150 . 
Figs. 39 & 40. Later stage in which the double nature of the segment is 
more clearly visible: about six large segments are present in each nucleus, with 
several smaller ones. (X 1150). 
Figs. 41, 42, 43 & 44. Similar stages, all showing double segments of 
different lengths. In the shorter ones further fragmentation seems to be going 
on. At x in Fig. 43, are seen two long pairs which may have arisen from a 
single loop. (X 1150). 
Fig. 45. shows almost fully formed short and long chromosomes; the 
tetrad appearance of the short ones is very striking. (X 1150). 
Figs. 46 & 47. are darkly stained preparations showing the longitudinal 
split only very indistinctly. At x in Fig. 46, is seen the last remains of a small 
nucleolus. (X 1150). 
Fig. 47 b. is obtained from a preparation with an intermediate depth of 
stain. In all these last figures the thin linin threads connecting the segments 
are clearly visible. (X 1150,. 
