280 J. B. GATENBY AND J. H. WOODGER 
is intimately associated with the formation of the acrosome, 
but the form chosen did not provide the very clear evidence 
wanted. In the spermatogenesis of the louse, Doncaster 
and Cannon (5) observed that the acrosome was formed from 
a body which they took to represent the Golgi apparatus. 
According to the account given for Smerimthus (10) by 
Gatenby, and for Pediculus by Doncaster and Cannon, all the 
Golgi apparatus is taken up in the formation of the acrosome. 
Our recent observations on Stenobothrus, and on several 
other moths (e.g. Biston), have shown that in these insects 
much of the apparatus finally passes as isolated crescents, 
spheres, or dictyosomes into the elongating tails of the sperma- 
tozoa: this matter is far from bemg cleared up, but of one 
thing we may feel certain—that the Golgi apparatus of insects 
is related to the formation of the acrosome. 
Turning now to our observations on the acrosome of the 
cavy, we note that the account we give agrees in general with 
that previously described for Paludina (12). In both animals 
we find a Golgi apparatus (plus archoplasm) which moves 
up to the front end of the nucleus of the spermatid, deposits 
a granule there, remains for a time, and finally passes away 
from the head end of the sperm into the lengthening tail. 
Papanicolaou and Stockard describe the proacrosomic 
material as appearing inside the archoplasm as a differentiated 
area of the latter, which stains specifically in acid fuchsin. 
Here we have the crux of the whole matter: is the pro- 
acrosomic material, which later forms the acrosome, to be 
regarded as a product of the archoplasm, or of the dictyosomes 
or Golgi elements ? We believe that this matter may be settled 
after the events im the formation of the acrosome of insect 
spermatids have been more fully examined: this remark 
refers especially to the Smerinthidae. 
Another point to which we would lke to draw attention 
is the fact that in the guinea-pig the Golgi apparatus (the 
‘Nebenkern’ of some older authors) embraces the forming 
acrosome from the stage when the proacrosomic granule first 
touches the nuclear membrane, up to the stage when the 
