CHROMOSOMES AND MITOCHONDRIA 279 
granules and chains of granules; the latter were also 
called chondriokonts; (3) plastosomes (plastochon- 
dria, plastokonta), employed by Meves (1910) be- 
cause of their supposed réle in histogenesis; (4) 
éclectosomes, selected by Regaud (1909) as a general 
physiological expression for chondriosomes ; (5) chon- 
driotaxis, used by Giglios-Tos and Granata (1908) 
to describe the parallel arrangement of chondrio- 
konts; (6) chondriodiérése, proposed by the same 
authors for the division of the chondriokonts during 
cell division; (7) karyochondria, coined by Wildman 
(1913) for cytoplasmic inclusions derived from the 
basichromatin of the nucleus; (8) chromidia, a term 
considered by Goldschmidt (1904) and others to in- 
clude the mitochondria. 
We are here especially interested in the mitochon- 
dria of the germ cells, their origin, fate, and signif- 
icance, but our ideas regarding the importance of 
these bodies in heredity depend somewhat upon their 
behavior in somatic cells. As already stated, 
Benda (1903) observed mitochondria in both germ 
cells and somatic cells. Since then they have been 
recorded in Protozoa, in almost every sort of somatic 
cell in Mrazoa, and in many plant cells (Fig. 77). 
Excellent reviews have been published by Benda 
(1903), Fauré-Frémiet (1910), Prenant (1910), and 
Duesberg (1912). These reviews have led to the 
conclusion already expressed by Regaud (1909, 
p. 920) that “it is probable that they (mitochondria) 
exist in all cells, at least at certain stages in their 
activities.” Among the somatic differentiations to 
