1 Heterotypical Reduction ' in Somatic Cells. 
803 
Figs. 12 and 13. Tetraploid cells from Galtonia root after 44 hours’ growth subsequent to experi¬ 
ment ; these have attained a great size, as may be seen from the dividing walls of the neighbouring 
cells visible ; they contain two nuclei, one of which is at rest (in Fig. 12), or in spireme (in Fig. 13); 
the other in process of degeneration. 
Fig. 14. Cell from root of Vicia Faba at distance from growing point, in permanent tissue ; the 
nucleus has fragmented into several bodies, and is in process of disintegration. 
PLATE LXVII 
P'igs. 15 and 16. Tetraploid cells from Galtonia root, containing diasters of greatly over the 
normal number of chromosomes : 47 in Fig. 15 ; 56 in Fig. 16. 
Figs. 17, 18, and 19 show tetraploid cells, Figs. 17 and 19 from Galtonia , Fig. 18 from Vicia 
Faba , containing two nuclei at same moment of activity; spireme, equatorial plate, or diaster. 
Figs. 20 and 21. Two large tetraploid cells from root of Vicia Faba, illustrating the fusion of the 
two contiguous groups of chromatin; in Fig. 21 the actual connexion between the linin network of 
the two groups is seen. 
Fig. 22. Transverse section of cell from normal root of Pisum sativum ; shows break at one 
end of the split chromosomes. 
Fig. 23. Transverse section of cell from chloralized root of Pisum sativum after 22 hours’ growth 
subsequent to an immersion for \ \ hrs. in 0-75 per cent, chloral hydrate. The chromosomes aie 
of a marked { heterotypical ’ character. 
Fig. 24. Transverse section of cell from normal root of Pisum sativum , fixed in acetic-alcohol ; 
shows intermediate shape between that of Fig. 22 and Fig. 23. 
Fig. 25. Transverse section of tetraploid cell from chloralized root of Pisum sativum after 
48 hours’ growth subsequent to immersion for i| hrs. in 0-75 per cent, chloral hydrate; shows 28 
chromosomes of approximately normal shape. 
Fig. 26. Longitudinal section of tetraploid cell from root of Pisum sativum after 22 hours’ growth 
subsequent to i| hours’ immersion in 0*75 percent, chloral hydrate; shows 28 chromosomes of pro¬ 
nounced ‘ heterotypical’ shape. 
Fig. 27. Cell from longitudinal section of root of Pisum sativum ; shows ‘ heterotypical ’ 
chromosomes coming out of the spireme stage. 
Fig. 28. Cell from normal Pisum sativum ; shows parallel arrangement of chromosomes on 
equatorial plate. 
