CYTOPLASMIC INCLUSIONS OF THE GERM-CELLS. 453 
In later stages, after the assumption of the vesicular shape, 
the acroblasts are readily mistaken for mitochondria. 
Thos. H. Montgomery, jun. ( 9 ), in his paper on the “ Sperma- 
togenesis of Euschistus,” figures in PI. I, fig. 1, a sperma- 
togonium with “mitosome” and “ idiosome.” According to 
my interpretation his “ mitosome ” is a spindle bridge, and 
his “ idiosome ” a cloud of minute mitochondrial granules. 
His mitochondria in late stages I believe to be run together 
into threads by the acid fixatives he has used. His mito- 
chondria possesses no chromophobe zone, they are all chro- 
mophile, and his figures of maturation divisions give the 
impression that the mitochondrium is being divided auto- 
nomously. If one examines Henneguy’s figures of Pyrrho- 
co'ris apterus, stained in violet dahlia intra vitam Les 
Insectes/ p. 661), it will be seen that the mitochondria form 
long fibres, but that each rod consists of a number of mito- 
chondrial grains containing the chromophobe zone. I there- 
fore believe that the mitochondria of Euchistus are really like 
those of Pyrrhocoris, only Montgomery has used acetic acid 
and produced threads. 
We now come to the question as to whether the filament or 
the granule is the true form of the mitochondrial body. My 
study of the Lepidoptera causes me to believe that with 
proper fixation the mitochondria will be found to be in the 
form of grains, but that the grains often tend to lie in chains, 
as Henneguy shows ( f Les Insectes/ p. 661), and that brutal 
fixation produced by acetic acid, or by other unsuitable 
media causes the whole chain to coalesce. Even Champy and 
Flemming free from acetic often cause distortion, if not 
properly diluted to suit the material used. 
I have at present very little evidence to offer concerning 
the theories of division of mitochondria, and as to whether 
.they are the " chromosomes of the cytoplasm,” as Meves 
would say, but I feel sure that no division of the mitochondrial 
body in the maturation divisions can be demonstrated with 
any degree of certainty. The view I take is that the mito- 
chondrial granules are not divided individually into parts, but 
