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Fig. 6-19 (a) and (b) Twelve chromosomes attached to the 

 wall of the nuclear vacuole. (a) Is high focus and (b) is low 

 focus of the same cell. (c) Five pairs of chromosomes attached 

 to the wall of the vacuole. (d) One focus of a cell containing 

 six pairs of chromosomes; only five pairs are visible in this 

 optical section. (e), (f), (g), stages in formation of complex, 

 (h), (i), (j), newly formed complex with longitudinal split. (k) 

 Cell with a chromosome with attached nucleolus (?), vibrating in 

 the vacuole. (1), First division of a resting cell, showing two 

 mitochondria, one in the mother cell and one in the bud. All but 

 (f) are photographed with a Spencer phase-difference lens. 



6-25 



