CHROMOSOMES AND MITOCHONDRIA 281 
small, transparent, slightly refringent granules of a 
pale gray tint, either homogeneous or else vesicular 
with fluid contents and a thin, denser, refringent 
periphery. Rod-like mitochondria were likewise 
observed by Montgomery (1911) in the living male 
germ cells of Huschistus (Fig. 78, 4A—B) which had 
been teased out in Ringer’s solution; and this in- 
Fig. 78.— Division of mitochondria. A-B. Mitochondrial rods divid- 
ing during first maturation division in Euschistus. C. Stages in 
division of mitochondrial body in Hydrometra. D. Simultaneous 
division of micronucleus and mitochondria in Carchesium (in vivo). 
(A-B, from Montgomery, 1911; C, from Wilke, 1918; D, from 
Fauré-Frémiet, 1910.) 
vestigator concluded that in preserved material “‘we 
have been working with images that are very close 
to the living... .”’ More recently Lewis and 
Lewis (1914) have made careful studies of mitochon- 
dria in living cells from chick embryos. Granules 
were here seen ‘‘to fuse together into rods or chains, 
and these to elongate into threads, which in turn 
anastomose with each other and may unite into a 
complicated network, which in turn may again 
break down into threads, rods, loops, and rings.” 
Even more remarkable are the movements within the 
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