282 CLAVFOLE: [Vox. XIV. 
The origin of the germ cells is another question of extreme 
interest. It was only after prolonged study that the interpre- 
tations of the facts observed in Anurida, as given above, were 
formulated. One point observed in Lepisma corroborates in 
part the conditions described in Anurida. It is clear that, as 
in Blatta, the germ cells are subject to great changes of posi- 
tion. According to Heymons they have an ectodermal origin, 
and appear early in embryonic life. The formation of egg tubes 
and their connection with each other are all steps accomplished 
by the process of migration. There is clearly nothing meta- 
meric in their origin, and any such arrangement must be sec- 
ondary. At present nothing further can be said on the diverse 
origins of the germ cells, — from the ectodermic in one case 
and mesoderm in the other. 
