J. Smolak 



147 



chromatin grains (Fig. 17). The shrivelled remains — probably dead — 

 of the septum-like nucleus appear as a homogeneous substance (Fig. 17) 

 which stains uniformly and somewhat differently from the nuclear 

 substance in the earlier stages. The migration of the chromatin from 



Fig. 17 Cells from palisade tissue. Three of them showing disorganised content; 

 chloroplasts destroyed ab^ 1 mostly vacuolised; remains of nuclei (in the long cells 

 on each side) homogeneous and without chromatin granules. The fourth cell, 

 the short one in the middle below, is normal. 



the nucleus was described in Nematode-ga\h by Nemec (11, pp. 171, 

 483) and by Guttenberg (vide 7, p. 202) in the galls of Ustilago maydis. 

 It is doubtful whether the phenomenon here has any definite relation 

 to mitochondria as they are conceived by Arnoldi 1 (vide 15, p. 707). For 

 the chromatin grains in the cytoplasm just outside of the nucleus very 



1 Arnoldi states that the mitochondrium is the same as the chromidium, viz. that 

 the mitochondrium is of nuclear nature. But this view has very few adherents to-day. 



10—2 



