CHROMOSOMES AND MITOCHOXDRIA 281 



small, transparent, slightly refringent granuk's of a 

 pale gray tint, either homogeneous or else vesicular 

 with fluid contents and a thin, denser, rci'ringcuL 

 periphery. Rod-like mitochondria were likewise 

 observed by Montgomery (1911) in the living male 

 germ cells of Euschistus (Fig. 78, A-B) which had 

 been teased out in Ringer's solution ; and this in- 



A O 



Fig. 78. — Division of mitochondria. A-B. Mitochondrial rods divid- 

 ing during first maturation division in Euschistus. C. Stages in 

 division of mitochondrial l)ody in Hudromctra. D. Sinniltnnt'oua 

 division of micronucleus and mitochondria in Carchcsium (in vivo). 

 (A-B, from Montgomery, 1911; C, from Wilke, 1913; D, from 

 Faure-Fremiet, 1910.) 



vestigator concluded that in preserved material "we 

 have been working with images that are very close 

 to the living. ..." More recently Lewis [{\u\ 

 Lewis (1914) have made careful .studies of niiloclion- 

 dria in living cells from chick embryos. Granules 

 were here seen *'to fu.se together into rods or chaius, 

 and these to elongate into threads, wliich iu turn 

 anastomose with each other and may nnilc into a 

 complicated network, which iu turn may again 

 break down into threads, rods, loops, and rings." 

 Even more remarkable are the movements within the 



