ioiG] 



NO TUNA GEL— REDUCTION DI\ 'IS IONS 



455 



along that portion (figs. 2, 3). In the beginning the vacuoles are 

 short, narrow slits (tigs. 2, 3), but later, owing to their enlargement, 



6 , c . d a b , c , d 



I \ — g gg _■-.■. j . ■...■ -. , 1 a ^..;.. ^gg 



'2 



Fig. i.— Diagram to illustrate reduction divisions as found in Allium trim, cm, 

 4 chromosomes only being shown: (1) telophase of last division of sporogenous tissue; 

 (2) late telophase of same; (3) resting nucleus of pollen mother cell; (4) late resting 

 condition; (5) going into synapsis; (6) condition of thread during synapsis and spirem; 

 (7) segmented; (8) condition at time of third contraction and multipolar spindle; 

 (9) metaphase; (10) anaphase; (11) telophase; (12) spirem of daughter nucleus! 

 (13) segmented spirem of daughter nucleus; (14) metaphase; (15) anaphase; (16) 

 tetrad or granddaughter nucleus. 



the chromatin bordering the two sides of the vacuoles becomes 

 more widely separated, although still joined together by portions 

 or strands of chromatin that separate the vacuoles, resulting in 



